Signature Move

Many characters have a specific skill, attack, taunt, evasive maneuver, and/or spell they use more frequently than any of their other ones; this is the character's Signature Move. Sometimes, however, a Signature Move, like a Catch Phrase, may turn out to be more an example of Never Live It Down; i.e. the character doesn't actually use the move that much, but everyone calls it their signature move, most likely because it became a Crowning Moment of Awesome.

Any move or trope listed on Grandfather Clause is likely a Signature Move, as well.

Anime and Manga

 * Goku and his Kamehameha beams. Krillin's Kienzan Destructo Disk. Gohan's Masenko. Piccolo's Makankosappo Special Beam Cannon. Vegeta's Gallic Gun. Tienshinhan's Kikouhou Tri-Beam. Yamcha's Rōgafūfūken Wolf Fang Fist and later the Sōkidan Spirit Ball. And pretty much every other Kamehame Hadoken in the series.
 * Worth noting is that the Kamehameha was Master Roshi's signature move. As in, he invented the thing and made it world famous.
 * Also worth noting is that Vegeta doesn't have a real Signature Move in that he doesn't keep using the same techniques. He uses the Galick Gun only once in the manga.
 * An interesting aversion is To Aru Majutsu no Index. While each esper has only one ability, they try to find as many different uses for it as possible, most notably Misaka Mikoto. The best mage in this setting is a non-specialised one, because he is therefore more versatile and can counter more spells himself. And yet every single mage in this setting tends to have an affinity for certain couple of spells and hammers down everything with Innocentius, Ellis, etc.
 * However, she isn't called Railgun for nothing, therefore playing this trope completely straight.
 * Hokuto Hyakuretsuken has to be the best known move ever because of this. And if we're including taunts, Kirby and Jigglypuff in Super Smash Bros..
 * In Ranma ½, Ranma has his Hiryuu Shoten Ha (the "Heavenly Dragon Ascension Wave" that creates a gigantic tornado) and The Rival Ryouga his ShiShi Hokodan ("Lion Roar Shot" -- a Ki Attacks powered by sheer literal Angst Nuke). Spoofed with Genma and his "Crouch of the Wild Tiger" (which is shameless grovelling).
 * Naruto: Naruto's Shadow Clone Jutsu and Rasengan, Sasuke's Chidori ("One Thousand Birds") & Sharingan, Kakashi's RaiKiri (his more-powerful version of the Chidori), Rock Lee's Primary Lotus, Shikamaru's Shadow Manipulation Jutsu (or whatever it's called), Choji's various Expansion Jutsus, Ino's Mind Control Jutsu, Neji's Byakugan and 8 Trigrams 64 Palms, Itachi's Mangekyo Sharingan and Tsukuyomi, the different summoning jutsus, and many more. Practically everyone has one. Or more.
 * Pokémon: Pikachu's Thunderbolt, Charizard's Seismic Toss. The former is later replaced with a Volt Tackle.
 * Pretty much everyone in Bleach only has one or two moves, so by definition this would apply.
 * Ichigo's Getsuga Tenshou, a "slashing projectile" of some kind,
 * Byakuya's Senbonzakura, where his sword splits into shards that look like sakura petals and cut the target a new one. He also has several signature kido spells and specialises in Flash Step.
 * Renji's attack where the sections of his sword split apart and fly at the target (higa-zekko, I believe).
 * Higa-zekko is a Desperation Attack - he can only use it when his sword is already in pieces. His Bankai firing a blast of energy is a more fitting example.
 * Mayuri's poisons wilt different deliveries - his shikai is a poisoned sword, his bankai is a giant centipede with infant's face that breathes a cloud of the stuff.
 * Although Rukia Kuchiki has used other kido spells at times, in combat she regularly uses "Hadou 33" (Soukatsui, "Blue Fireball").
 * Suffice it to say, everyone's Shikai is their first signature move, and if they have a Bankai, it's their second. And then there are the Kido.
 * Ippo's Dempsey Roll, Sendo's Smash, Vorg's White Fang, Mashiba's flicker jabs, Kimura's Dragonfish Blow, Aoki's frog punch...
 * From Inuyasha:
 * Inuyasha's wind scar.
 * Miroku's wind tunnel.
 * Shippo's foxfire.
 * Code Geass: Kallen's signature face grab.
 * And Suzaku's patented Spinzaku Kick
 * Jotaro's Star Platinum's Rapid-Fire Fisticuffs (once lampshaded by a villain, who called it "the Ora Ora Ora") and Dio's the World in JoJo's Bizarre Adventure. There's also Kakyoin's Emerald Splash and Avdol's Crossfire Hurricane.
 * Jotaro's ORAORAORA actually does have semi-official name; the Fighting Game calls it "Blazing Fists".
 * Negi, the lead of Mahou Sensei Negima has favored Jovis Tempestas Fulguriens (Jupiter's Storm of Thunder) as his major finisher since day 1. He has gained much stronger spells over time, but he never really stops using it.
 * Fate Averruncus is fond of Pnoe Petras (Breath of Stone), which he usually uses to petrify people, thereby winning without wasting his time with an actual fight.
 * Setsuna's seems to be either Zanganken (Stone-Cleaving Sword), which was the first technique she ever used in the series or Shin Raikouken (True Lightning Sword) for the incredible display it put on during her fight with Evangeline.
 * Nanoha from Magical Girl Lyrical Nanoha tends to use her Divine Buster and Starlight Breaker to befriend... lots of things, really.
 * In Slayers Lina tend to express her strong disapproval in a way predictable even more than impressive. "Dragon Slaaaaavu"! There's also Amelia and her Vistfanrank spell, and Zelgadis' Astral Vine spell, both which act as enhancements. The aformentioned two also use the Ra Tilt spell frequently, usually together. In the novel series, there is also Luke's Ruby-Eye Blade spell.
 * There's a ton of them in Sailor Moon:
 * Sailor Moon: Moon Tiara Action/Moon Frisbee, Moon Healing Escalation, Moon Princess Halation, Moon Spiral Heart Attack, Rainbow Moon Heartache, Moon Gorgeous Meditation, Starlight Honeymoon Therapy Kiss, and Silver Moon Crystal Power Kiss, all in that order. There is also a manga-only ultimate attack, Silver Moon Crystal Eternal Power.
 * Sailor Mercury: Shabon Spray, Shine Aqua Illusion, Mercury Aqua Rhapsody
 * SailorMars: Fire Soul, Akuryo Taisan (exorcism for demons), Burning Mandala, Mars Flame Sniper
 * Sailor Jupiter: Supreme Thunder, Flower Hurricane (in the manga), Sparkling Wide Pressure, Jupiter Oak Evolution
 * Sailor Venus: Cresent Beam, Venus Love-Me-Chain, Venus Love and Beauty Shock
 * Sailor Pluto: Dead Scream, Chronos Typhoon (manga only)
 * Sailor Uranus: World Shaking, Space Sword Blaster, Space Turbulence (manga only)
 * Sailor Saturn: Death Reborn Revolution, Silence Glaive Surprise
 * Sailor Chibi Moon: Pink Sugar Heart Attack
 * For Tuxedo Mask in the anime, there's his signature rose toss, while in the manga, he has his own power, Tuxedo La Smoking Bomber.
 * Sailor Neptune: Deep Submerge, Submarine Reflection, Submarine Violon Tide (manga only)
 * In the Nasuverse, users of "True Magic" (sometimes called Sorcery or Magic, depending on the translation) all have a single unique ability. Then there's Reality Marbles, which are Reality Warper Personality Powers with a specific effect unique to the individual (e.g. transforming the owner's body into a mass of beasts or producing perfect recreations of swords) and which a skilled magus can expand outward into a Fisher King effect.
 * Fushigi Yuugi gives us Tasuki. "REKKA SHIN-EN!"
 * In Fairy Tail According to Word of God, Fire Dragon's Iron Fist (Karyu no Tekken) is Natsu's signature move. (Insert Element)Dragon roar seems to be a signature move for all Dragon slayers though.
 * Erza's Heaven Wheel Armor seem to be her Signature Armor.
 * It even has it's own theme
 * From Soul Eater:
 * Maka/Soul: lately Demon Hunter
 * Black*Star/Tsubaki: Deadly Big Black Star Wave(Black Star only) and later Shadow Star
 * Death The Kid/Liz/Patty: Death Cannon
 * Shinigami: Shinigami Chop
 * One Piece has Luffy with...several attacks. While his most notable may be Gomu Gomu no Pistol and its variations, he's also used Gattling and Bazooka a fair amount.
 * Ace and his Fire-fist (Hiken). It's his epithet after all.
 * Magellan has his poison dragon "Hydra"
 * Ivankov and his "Hell-Wink"
 * Prince of Tennis
 * Ryoma and his Twist Serve and Drive moves
 * Momoshiro's Dunk Smash
 * Kaidoh's snake
 * Tengen Toppa Gurren Lagann: Simon's GIGA DRILL BREAAAAAAAAAAAAAAKAAAAAAAAAAAAA
 * Every major character in G Gundam has at least one, but in particular the School of Touhou Fuhai has the various Finger attacks (including Domon's Shining Finger and Bakunetsu God Finger and Master Asia's Darkness Finger ) and the Sekiha Tenkyoken.
 * Gundam Wing has a somewhat Narmful invocation of this in Endless Waltz, where Duo recognizes that the enemy machine attacking him is piloted by his friend Trowa because it uses his technique...namely, spamming his Gatling gun. The manga adaptation fixes this by having the tell be Trowa's use an acrobatic dodge.
 * Mazinger Z has Koji Kabuto's and Mazinger's Rocket Punch and Aphrodite(or really, every FemBot) has its Torpedo Tits. Or arguably Koji's most used weapons as well which includes its Breast Fire and Photon Power/Koshiryoku Beam
 * Its sucessor Great Mazinger has its iconic Thunder Break which is its most used weapon and BY FAR the most notable, since its the move that Tetsuya used whenever he does the Big Damn Heroes duty.
 * Kamui Den: Kamui's most iconic technique is the "kasumi-kiri," in which he draws a short sword from a hidden position in the back of his obi and cuts his oponent horizontally. A close seoond is the "izunatoshi" used during tree top battles with other ninja

Comic Books

 * Doctor Strange, when appearing outside of his own stories, has a couple of spells he uses pretty regularly: the Eye of Agamotto and the Crimson Bands of Cyttorak.
 * Knights of the Dinner Table. When Brian plays a magic user his character almost always casts Fireballs in combat. One of his Catch Phrases is "Fireball coming online!"
 * The X-Men have the "Fastball Special" and variations thereof when Colossus & Wolverine aren't available or on the appropriate team.
 * Franky has "Knife to the eye!"

Film

 * Godzilla's Thermonuclear Breath.
 * In Star Wars, Darth Vader is associated with the Force Choke, Force Lightning is Palpatine's favorite ability, and everyone remembers Obi Wan's use of the Jedi Mind Trick ("He full-on Obi-Wan-d me!"). Oddly, the films never show Vader using the Force Choke on an actual enemy, just people who've failed him or done something else to piss him off.
 * MacGruber has his signature throat rip.
 * Troy, Achilles has his jumping downward stab, which he uses in his Single-Stroke Battle at the beginning of the film and several times after. Hector is the only one who can defend against it, showing that he is a Worthy Opponent.

Literature

 * Harry Potter's tendency to favor Expelliarmus (because he prefers disarming his enemies to hurting them) becomes an issue in Harry Potter. Early in the book its use is what exposes him as the real Harry in a group of fakes. Never mind that the other Harrys made it blatantly obvious which one was real earlier...
 * Although for such a harmless spell, it is what
 * Harry also has a reputation for producing Patronuses. (These are essentially anti-Dementor apparitions.) Dementors are Harry's worst fear, so it would make sense. Considering the effort he had to put into getting the spell to work at all, it's deserved.
 * Ginny Weasley has the Bat Bogey Hex.
 * Inverted for Antonin Dolohov, a minor Death Eater appearing in the book series, where he is almost always at the receiving end of the full Body-Bind Curse (if he appears, that is).
 * Gilderoy Lockhart has a talent in Memory Charms, though we only get to see him directly using it once.
 * While certainly not the only wizard to use it in the series, it's hard to say that Lord Voldemort's signature move is anything other than Avada Kedavra.
 * Crucio is his other signature move, not to mention Bellatrix Lestrange's main one.
 * Harry Dresden and his Shield spell. It might be using the bracelet rather than straight up casting, but it's still his first magical response to just about anything trying to kill him.
 * That's not his signature move. His signature move is Fuego. To the point where, in one book, his enemies were able to track him based on his use of fire magic.
 * To the point that one of his enemies has her goons attack him with flame throwers as poetic justice.
 * Stephanie Plum frequently uses Groin Attack to subdue her skips. Lula favors forcefully sitting on them.

Live Action TV

 * The Kamen Rider franchise has a flying side kick known as the Rider Kick. Nearly every headlining Rider has some form of it as their default Finishing Move, and the few that don't will do a leaping kick on occasion anyway.
 * On Heroes, Sylar really likes to use his telekinesis to slice through people's foreheads. Originally, this was just practicality: his power required access to his victims' brains in order to steal their abilities. Then he started doing it to everyone, whether they had an ability to steal or not. In Volume Four, he recovers a repressed memory and discovers.
 * Charmed: "The Power of Three will set us free!"
 * Power Rangers: Tommy's tornado kick.
 * Kaizoku Sentai Gokaiger: Joe/Gokai Blue realizes that Mentor Cid Bamick was turned into Barizorg when the latter uses Cid's Signature Move (an X-shaped Sword Beam). Joe himself begins using the move, particularly when he fights the Mad Scientist who cyborged Cid and.
 * On the Seattle sketch-comedy Almost Live, Billy Quan always finished his "Mind Your Manners" shorts with a double-footed jump-kick that could go for blocks, travel around corners, wait for an elevator..

Manhwa

 * Last Fantasy had a spellcaster who dropped out of school after learning only the Fireball spell. He makes the most of it.

Professional Wrestling

 * Pretty much every wrestler ever has at least one Finishing Move, and one or more other moves they use on a regular basis. For example:
 * Bret Hart, John Cena, Shawn Michaels, and many others each have their Five Moves of Doom.
 * Stone Cold Steve Austin, of course, had the Stone Cold Stunner, but was also a frequent user of the Lou Thesz Press (usually follwed by repeated punches to the face), and often uses repeated stomps in the corner.
 * The Undertaker's famous rope-walk forearm club is always a sight to see.
 * Rey Mysterio, Jr. has his 619, which is arguably more famous than his Finishing Move (a springboard splash). It was even featured in an episode of Heroes.
 * Rey has a few other springboard finishers, but they are always preceded by 619, which could account for popularity of the move.
 * There are a lot of wrestlers that have a move that isn't their Finishing Move but is just as iconic to the wrestler, they're usually a move that is hard to do or done really well.
 * Shawn Michaels' Diving Elbow Drop has never gotten a pinfall, but it's still seen once a match.
 * Chris Jericho's Lionsault, he rarely ever gets a pinfall out of it, but yet its regarded as one of his best moves.
 * Rob Van Dam's Rolling Thunder.
 * TNA wrestler AJ Styles' Pele Kick is not a finishing move, but it's a move that's so iconic of AJ that when John Morrison used it, WWE commentators called it the Pele kick.
 * Kurt Angle and Chris Benoit were famed for their German Suplexes, both of their primary finishers were submission moves however.
 * Triple H's Double A Spinebuster, which was one of his idol's, Arn Anderson's Finishing Move.

Tabletop RPG

 * In Dungeons and Dragons tradition arcane spells are named for their creators (the rest of the classic spells were supposed to be mostly named this way too, but by now became too old and widespread to remember the origin). Sometimes this shows the named wizard's predisposition to one effect with different power levels.
 * Spells & Magic game mechanics suports signature spells as such, for one known spell at each spell level. Wizard re-uses the normal research procedure for a spell to get all fine details, spends a slot or CP and then specializes in it much like a fighter in the weapon: one extra memorization and either +2 to levels variables or -2 to saving throw or -3 to casting time.
 * d20 replaces most of setting-specific (and copyrighted) names with "mage's" or removes them (Bigby's ____ Hand -> ___ Hand).
 * In D&D 3 Spell Mastery feat allows to memorize a specific spell without a spellbook. "Spell secret" ability allows to permanently apply one of metamagical modifications to a known spell (more spells with levels), but for some reason it's only class ability of Wu Jen from Complete Arcane and Mystic from Dragon Magazine. d20 core Archmage can make a spell-like ability (no preparation, no components, harder to negate) from a known spell, but it's not the same as normal casting.
 * Greyhawk - "Bigsby's -ing Hand/Fingers/Fist", "Melf's ", "Otiluke's Sphere/Screen". Tenser ran with force effects (Floating Disc, Destructive Resonance) and body enhancements (Eye of the Eagle, Transformation); Nystul with magical radiations (Magic Aura, Radiant Baton, Blacklight Burst...), etc.
 * Forgotten Realms, though only minor series are like this: "Nybor's ", "Snilloc's ", "Symkalr's Fireball".
 * Netheril campaign set not long after the time when a lot of the oldest spells in the book were (re-)invented, got names for them, with very strong personal themes. E.g. Shocking Grasp = Volhm's grasp, Lightning Bolt = Volhm's bolt, Chain Lightning = Volhm's chaining.
 * D&D 3 Forgotten Realms rules has "Signature Spell" feat which allows to cast one "mastered" spell instead of any arcane spells of the same or higher level, much like D&D 3 cleric converts into cure spells. And "Spell Thematics" feat for visual effects, when appliable (e.g. if the wizard's theme is "fiery", a magic missile will look like fire bolt, though it still isn't) - mechanically, it hinders identification of modified spells.
 * The Solar Exalted actually have a Charm, Thunderbolt Attack Prana, that allows them to designate "signature attacks." By using said signature attack and paying the cost of the Charm, they're able to do ridonkulous amounts of damage.

Video Games

 * Every fighting game, ever.
 * From Mortal Kombat:
 * Scorpion's "Get over here!" spear attack.
 * Sub-Zero's freeze blast.
 * Liu Kang's Bicycle Kick and Dragon Fatality
 * Johnny Cage's Groin Attack
 * Rayden's torpedo
 * From Street Fighter:
 * Ken and Ryu's Kamehame Hadoken.
 * Ken has also been increasingly associated with Shoryuken.
 * Guile and later Charlie have the Sonic Boom and the Flash Kick.
 * Chun-Li's lightning kick and E. Honda's Hundred Hand Slap.
 * Sagat's Tiger Uppercut.
 * M. Bison's Psycho Crusher.
 * Zangief's Spinning Piledriver.
 * Akuma's Shun Goku Satsu.
 * From Soul Calibur:
 * Would Sophitia's, erm, face-sitting throw count as the Never Live It Down version?
 * Pretty much anything Ivy does counts, simply because she has a unique weapon and is pretty distracting as a fighter. If anything, her "summon suffering" may be Ivy's single one, because it's hard to pull off and, let's face it, looks awesome.
 * From Tekken
 * Paul Phoenix's Burning Fist or Phoenix Smasher.
 * The Mishima style users' Spinning Demon or Lightning Uppercut variants.
 * Devil's Infero and Devil Jin's Hellfire Blast.
 * Law's Somersault Kick.
 * Nina and Anna's Blonde Bomb.
 * Steve's Spitfire.
 * Any of King's multi-hit throws that end in a Muscle Buster, which usually doubles as his Finishing Move.
 * Marduk's Double Leg Takedown.
 * Jinpachi's Demon Inferno.
 * Falcon PUNCH!
 * Mario and Luigi, of course, have their iconic Jumping move. Fireballs, as well.
 * Bowser has his fire breath attack, and his Shockwave Stomp.
 * Link's Spin Attack from Zelda, which was introduced in The Legend of Zelda a Link To T He Past and has been a staple of the series ever since.
 * Genis Sage in Tales of Symphonia always uses Fireball in cutscenes, even after he has gained much stronger spells.
 * This is because due to the nature of the skill/spell learning system in the game, the only spell he is guaranteed to have at all points in the game is Fireball. If you're doing a very good Low-Level Run, for example, he might not have any of his other basic spells, and you can, if you learn all the spells of one type (Strike or Technical), switch quite a few, if not all, of his spells to the other type in as few as one battle, if you're up against a foe with enough HP to withstand casting their base spells multiple times (just forget all the spells you want to change before the battle, then start casting each element's base spells until he learns the more advanced versions).
 * Specials from Skies of Arcadia -- Vyse's Rain of Swords (specialized wind/electric spell), Aika's Lambda Burst, Fina's Lunar Blessing (regeneration), and so on.
 * Many Touhou characters have signature spell card attacks. Reimu has Fantasy Heaven, Marisa has Master Spark (which she stole from Yuuka and made her own), Cirno has Icicle Fall and Perfect Freeze, Patchy has Royal Flare, and so on.
 * Zero of Mega Man X and Zero has the Z-saber combo, consisting of three (in X8 it can be upgraded to five) slashes with his infamous Laser Blade. In the same series, Axl's Copy Shot could count as well.
 * Even older than Zero's triple-slash combo was his dual-Z-Buster-then-Sword Beam combo from X2, which made recurring appearances in X5 and X6, . Curiously, you never quite have access to it when playing as Zero (the closest we ever got was X3, and even that was just a Z-Saber slash, with no sword beam).
 * Not quite. The player can get access to the full move during X3, but as X, rather than Zero. If you do the appropriate miniboss fight near the end of the game with Zero, the trashed remains of said miniboss battle will crash on top of him; X will arrive shortly after, and Zero will give his Z-Saber to him, essentially giving him the exact same combination after an additional charge level (charge lv4 = X-Buster blast No.1, X-Buster Blast No.2, Z-Saber slash with Saber Beam).
 * And of course, Mega Man himself has his trusty old Mega Buster, which is his initial weapon in all of his games and serves him well through the entire game, since it has infinite energy, unlike his other weapons that he gains later.
 * Sonic the Hedgehog and his trademark Spin Dash and Homing Attack.
 * Shadow has Chaos Control and other Chaos-related moves.
 * Kirby has the Final Cutter, introduced in Kirby Super Star. Since then it has appeared in most of his games (except Kirby 64), as well as his Up+B attack in Super Smash Bros..
 * Of course, one could also consider his signature moves to be sucking up and spitting out stuff, as well as Mega Manning (though it didn't appear until Kirby's Adventure).
 * King Dedede has the hammer attack, as well as the Super Dedede Jump.
 * So far, every Valkyrie in the Valkyrie Profile series can use Nibelung Valesti.
 * Final Fantasy: Most characters in the later games have a Limit Break that will usually be seen as their signature move, (e.g. Cloud's Omnislash.) Most classes have a move that's identified with them, especially the Dragoon's Jump.
 * Mega Ten or Persona games featuring Alice show her regularly possessing the destructive Die For Me! attack. She summons armies of corrupted Wonderland soldiers and has them skewering her enemies from the sky.
 * The equivalent Hama move ("Die For Me!" counts as Mudo) is "Samsara", traditionally possessed by Daisoujou. (A "daisoujou" is a Buddhist monk who opted to starve to death, drinking tea that contains small amounts of embalming fluid until his demise, thereby creating a "living Buddha".)
 * Metatron has Fire of Sinai, a rain of Almighty-type holy fire.
 * Beelzebub has Death Flies, a swarm of, again, Almighty-type monstruous black flies that either fully devour you in one go or leave you half-eaten with very little hope to survive.
 * Surt, the fire giant from Norse Mythology has his signature Fire spell Ragnarok.
 * Mara and "Maralagidyne". Oh, yuck.
 * From Persona 2, we have these gems from Innocent Sin: Tatsuya/Apollo's Nova Cyther, Eikichi/Hades' Bloody Honeymoon, Jun/Chronos' Cross Fortune, Lisa/Venus' Foamy Lover, Maya/Maia's Crescent Mirror, Baofu/Prometheus' Wiseman Snap, Katsuya/Hyperion's Justice Shot, and Ulala/Asteria's Twinkle Nebula.
 * Every Fiend has a signature move in Nocturne: Matador has Red Capote and Andalucia, Daisojou has Preach and Meditation, Hell Biker has Hell Exhaust and Hell Burner, White Rider has God's Bow, Red Rider has Terrorblade, Black Rider has Soul Divide, Pale Rider has Pestilence, the Harlot has Beast Roar and Trumpeter has Evil Melody and Holy Melody. Others examples are Skadi (Earthquake), Amaterasu (Godly Light), Dante (his entire moveset), Pazuzu (Wet Wind) Kurama Tengu (Starlight), Mada (Intoxicate), Valkyrie (Soul Recruit), Mithra (Death Pact) and Dionysius (Wine Party).
 * On a different angle, many of the Hito-Shura's exclusive attacks can be seen like this. Highlights include Freikugel, Magma Axis and Deadly Fury.
 * Many bosses have signature moves that are pretty relevant to the mythology behind them. Harihara has Chaturbuja, Vaikunta and Three Worlds (changed to Reincarnate in english), Brahman has Brahma Sutra and Izanami has Thousand Curses. For the Law and Chaos heroes,  and   have Left Hand and Right Hand respectively.

Web Comics

 * Eight Bit Theater's Black Mage and his Hadoken.
 * Nuclear Dan from Another Gaming Comic loves to spam fireball when he can, not using it's long range even, just closing in and centering on himself.
 * Vaarsuvius from Order of the Stick likes to Disintegrate those distracting monsters and use Explosive Runes on any opponent who can read.
 * Haley is big into sneak attacks. Meanwhile, early in Miko's run, Detect Evil was her signature ability, but it quickly shifted into three consecutive slash attacks.
 * In Drowtales, characters tend to have an affinity, a general sort of magic that their body or mind seems more attuned to. Several characters seem to have a signature spell as well:
 * Sil'lice: freeze an opponents blood while grabbing them, which apparently causes great pain.
 * Faen: empathic healing
 * Chiri: prophetic dreams
 * Ariel's is becoming merging her body with another object
 * Mel: shapeshifting into a demonic figure
 * Early on in El Goonish Shive Elliot's was shown to be his Tamashii Gekido and Nanase's was her color clone technique.
 * Jack Noir from Homestuck has the attack Red Miles, which causes branching red tendrils to extend from his hand and devestate the terrain. The visuals are reminiscent of blood vessels forming, which is fitting given Jack's nature as
 * Who can forget Dominic Deegan's Spark and his enthusiastic "DEATH FROM ABOVE!", usable on everything from enemies to pies.

Web Original

 * Whateley Universe: Chaka's own version of the Hadoken, the 'Chaka Chaka Bang Bang'. And Aquerna's signature move, which may or may not have a real name: 'Squirrel Scampers Over Tree'.
 * Linkara, are you a man?
 * Penny Arcade's D&D Podcast: A literal example with Jim's Magic Missile, which scorches out JIM when it hits.

Western Animation

 * Mucha Lucha is all about these. There are entire episodes dedicated to one character's signature move.
 * The Flea's signature move is 'The Flaming Turkey of Glory!'.
 * Yang's Paws of Pain in Yin Yang Yo.
 * All the Dragons in Xiaolin Showdown have signature moves once they become apprentices and then Wudai warriors:
 * Omi - Tsunami/Tornado Strike, Wudai Nepune Water
 * Clay - Seismic Kick, Wudai Crater Earth
 * Kimiko - Judolette Flip, Wudai Mars Fire
 * Raimundo - Typhoon Boom, Wudai Star Wind
 * All four - Dragon X Kumai Formation, Wudai Orion Formation