Glacier Waif

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A character whose lithe, lightweight appearance suggests a Fragile Speedster (or, at the least, a character of average size compared to others) but it turns out they are a Mighty Glacier.

Compare with Cute Bruiser, where a fragile-looking character is strong, but not slow (also, this trope is not confined to female characters). Often feature Muscles Are Meaningless. This trope is the inversion of Acrofatic. May be a Super Strong Child depending on age.

Not to be confused with an Ice Queen, which has more to do with personality than toughness.

Anime and Manga
""There is nothing the Iron Hammer Knight and her Steel Count cannot break!""
 * Pictured above: Vita from Magical Girl Lyrical Nanoha is rather petite (even if her armor makes her appear bigger) but wields a giant hammer and she can take a lot of punishment: At one point she has a foot-long metal claw shoved through her sternum. Vita coughs up a bit of blood and keeps breaking things.


 * Asuna of Mahou Sensei Negima has a relatively average size in the cast (taller than most, but far leaner than the other warriors). Despite that, she's the most armoured of the Ala Alba, carries a BFS, and her magic cancel allows her to serve as the team's functional tank.
 * Flandre of Princess Resurrection is easily one of the shortest in the cast (she appears as a young girl). Being a gynoid, she's both incredibly strong and nearly indestructible, as well as quite slow due to her heavy weight.
 * Lisa Yadomaru from Bleach has a fairly slight build, but her shikai is a serious BFS (S standing for spear in this case). Ikkaku must be feeling pretty embarrassed right now. It's one of the biggest shikai yet revealed, rivaled only by Komamura's, Hitsugaya's, and sometimes Gin's and Renji's. Its size is even comparable to some bankai!
 * Crona from Soul Eater is easily the thinnest character in the series (to the point of being possibly anorexic) but due to the black blood that hardens his or her body, it's incredibly hard to hurt him (or her). Because the black blood is also capable of being used as a weapon, cutting attacks aren't a good idea; Maka has to resort to punching her (or him) in order to deal damage.

Comic Books

 * Cassandra Nova in X-Men. She looks like a frail old lady and she definitely is. But unless you can hide your mind from her telepathy to catch her off-guard, her other psychic powers allow her to tank absurd amounts of damage.
 * Also, Emma Frost, aka The White Queen, especially in her diamond form.

Live Action TV

 * Cameron of The Sarah Connor Chronicles is not actually all that fast, but when she's limping after you in the street or slowly stalking down a hallway, blasting away with a shotgun while shrugging off all your gunfire, she doesn't need to be.

Video Games, Visual Novels

 * Presea from Tales of Symphonia, who is the smallest playable character, but uses huge battle axes as her weapon of choice.
 * Tales of Vesperia gives us Karol, who doubles as a Combat Medic. He uses two handed axes, hammers, and swords as his weapons.
 * And from Tales of Hearts, we have Innes, who has a Hot Amazon build that leans more towards the appearance of a Fragile Speedster... but then you watch her carry a portable shop on her back and murder a room full of monsters with a water-axe-claymore-thing and it becomes clear that she's The Big Girl.
 * Triple subverted in Tales of the Abyss. Anise looks like she'll be a Fragile Speedster, but then she pulls out her ten-foot puppet and reveals that she fights on its back. So, the puppet is pretty slow but its attacks pack a punch. However, it's subverted even further when you realise that, while Tokunaga and Anise make quite the Sword and Sorcerer duo, their defence is still rather low; thereby making them a combination of this trope and Glass Cannon.
 * Double subverted with Chelsea. She is fairly nippy while running, hopping, and skipping about the arena, but her attack speed is slow compared to the likes of Stahn (and justifiably so, since she's The Archer). Even so, her techs still cause some respectable damage when they hit home.
 * From the same game, Philia is a magical version of this trope played straight, probably due to her being weighed down by her BFS. So what if she can't dance around the air like Rutee and Woodrow? She can cast Meteor Storm!
 * Said BFS is another double subversion, since it's very physically weak despite its large size, but it's the source of her immense magical power and thus the strongest of the Swordians.
 * Hinako Shijo in King of Fighters looks much like the rest of the female cast (she's thin, short and only 16 years old). Despite that, she's one of the slower characters who uses strength to her advantage. Why? Her style is sumo wrestling.
 * The rather petite Ashlotte from Soul Calibur IV is a reskin of Mighty Glacier Astaroth (as is obvious from her name). She shares his moveset, strength and low agility despite being barely more than half his size.
 * She is also entirely made of an unknown metal alloy, powered by dark magic, and is the second heaviest character in the game (only Angol Fear, who's an Eldritch Abomination of sorts and thus shouldn't be judged based on looks alone, is heavier), so her hitting like a dump truck and being about as fast in spite of being tiny compared to Astaroth makes sense - all that steel can't possibly move fast, and with so much mass behind her blows, getting hit by her is roughly equivalent to getting run over by a car.
 * Ryuuguu Rena in Higurashi Daybreak. With her "normal" weapon she's the Jack of All Stats, but with the axe she's a classical Mighty Glacier. She gets the Ironclad Cleaver in the expansion, and she becomes incredibly slow but her strength gets boosted to Game Breaker levels.
 * Well, she isn't exactly a Mighty Glacier with her axe, she's still pretty fast, she just has no range game. Her Ironclad Cleaver is classic Mighty Glacier though.
 * All female characters in World of Warcraft except for orcs, tauren, and dwarves can be this. The incredibly slender blood elf paladin can take a beating from a creature that would kill a draenei mage built like a truck in one blow.
 * And with death knights, one can be an incredibly durable waif covered in ice.
 * Exaggerated with female Undead Warriors (especially those with Titan's Grip.) Keep in mind that female Undead Warriors are pretty much devoid of muscle, that they are wearing the heaviest armor class, and that they are carrying some of the heaviest weapons in the game. Yet, they can perform front flips while carrying a burden that should crush them multiple times over. And Orc Warriors think they're strong...
 * In games with build customization like City of Heroes and Phantasy Star Universe, build is often purely aesthetic, so as long as your weak-looking character is of the correct class, they can take more punishment than stronger-looking characters that went with another class.
 * A.B.A. of the Guilty Gear series starts out like this in each match; she looks half-dead to begin with, and her habit of dragging her companion/giant sentient key Paracelsus everywhere can't be helping. She has a technique which consumes one of a limited supply of blood-packs, which increases her speed and power, but the effect wears off quickly.
 * Would you believe Roll has become one in Tatsunokovs Capcom? There's one caveat, though; she normally doesn't do much damage... but she has a special move that makes the next special move she uses do obscene, Mighty Glacier level damage. Two of her three hyper combos are also pretty hefty damage dealers. (the third is a non-damaging move that drops an item that heals her or other robots if it touches them, but knocks living characters off-balance if it connects with them.)
 * And there's a trick (sweeping up her own puddles) that lets you further enhance all her attacks, not just specials. She's probably the ultimate Glass Cannon Glacier Waif.
 * Ike can't exactly be called a "waif", but in Super Smash Bros Brawl, he's a pipsqueak when compared to other Mighty Glaciers like Bowser, Ganondorf and Donkey Kong. Despite this, he's a heavy character, attacks slowly, moves slowly, and hits like a train. Though in the Fire Emblem series, Ike is actually more of a Lightning Bruiser.
 * Same with Snake. He's even heavier than Ike, not to mention Ganondorf (a seven-foot guy in full plate armor), despite only wearing a jumpsuit and a Hyperspace Arsenal, and being human-sized.
 * Lucas is an even better example. He's as short as Ness or Kirby, but he fights like a Heavy character, with longer, slower moves that can hit absurdly hard.
 * Kimmy Eckman of Backyard Sports is short and thin, but is slow and a tank.
 * Kira Daidouji from Arcana Heart is a cute Token Mini Moe mad scientist... who's a throw-focused Mighty Glacier. In this case, justified by the fact that she uses a giant Blob Monster to do her fighting rather than fighting directly.
 * And Fiona, who lugs around a sword bigger than she is, and has the most damaging normals in the game with it.
 * Itsuki of Sengoku Basara, despite being a little girl lugs around a giant hammer and has the slowest attack speed of all the characters, even the definitive Mighty Glacier Xavi. However, she also has the option of tossing her Hammer and resorting to her fists, which while faster leaves her unable to block.
 * Perhaps she's not waifish enough to count, but Oerba Yun Fang of Final Fantasy XIII has the highest attack stat of the party and also majors in the Sentinel role, which specializes in acting as a meatshield for you other party members.
 * She's a variant -- her weapon, attire, and gender makes her look like a White Magician Girl or Black Magician Girl. She's anything but.
 * She looks like a Dragoon to me...
 * Due to measuring weight class by a character's height, Mario Kart Wii classifies both Rosalina and Waluigi as Large racers. Rosalina remains a "heavier" racer in Mario Kart 7.
 * Touhou, running as it does on a massive cast of Cute Bruisers and Little Miss Badasses beating the crap out of each other, has plenty of examples. In terms of story the best example is Suika Ibuki, by all appearances a horned eight-year-old child who can tear apart mountains and hurl black holes. In terms of gameplay the best example is Utsuho Reiuji, a frail-looking Winged Humanoid who in Hisoutensoku is an absurdly powerful Mighty Glacier.
 * Because of the Job System in Final Fantasy V, you can easily turn 14-year-old Krile/Cara into the party's tank.
 * Due to Loads and Loads of Characters in the Fire Emblem series, some character will inevitably fall into every character trope imaginable, including the Glacier Waif. A few that come to mind are Wendy from Sword of Seals, Knight!Amelia and Fighter or Pirate!Ross from Sacred Stones, and Nephenee from the Tellius series. Given the class change system in the new Shadow Dragon series, EVERY waif like character can potentially be a Mighty Glacier.
 * And even without class change (i.e. only a promotion to Dracoknight), wimpy-looking women like Caeda or Est are as strong as warriors -- they wield axes -- and have armor caps as high as generals.
 * Scrafty from Pokémon Black and White is a small gangster-like lizard, but it has high Defense and Special Defense and decent Attack. At the start of a battle it isn't a huge threat, but with a few Dragon Dances, the ability Moxie, great STABs, and great resistances (due to its Dark/Fighting typing), it becomes extremely hard to defeat, capable of one-shotting many opponents in its tier.
 * Many of the smaller legendaries can be a mixture of this and Jack of All Stats or Lightning Bruiser, due to equal stats in everything, but those being high stats.
 * Umbreon would be this, but it's more of a Stone Wall. Still, it's a small fox-like Pokémon.
 * Speaking of Eeveelutions, Glaceon is also like this, with amazing Special Attack and decent defenses. Also, Ice-type. However, its low HP/Speed and its poor defensive typing hampers this considerably. At least, when it'Ts by itself on the field.
 * Scizor looks like a Fragile Speedster as it's rather scrawny and seems capable of moving at high speeds. It even learns moves like Bullet Punch and Agility. Its highest stats are actually Attack and Defense with well below average Speed. Scizor's lasting power in spite of its Speed makes it popular to use.
 * Saber from Fate Stay Night, with the body of a teenaged girl, can soak up some mighty blows from world-class weapons and demigods. Though she has the speed and reflexes to nearly match speeds with the current incarnation of the Fragile Speedster, she usually relies on blocking and parrying attacks and only attempting to evade those attacks that she would not be able to survive.
 * Any mage from the Baldurs Gate series can potentially become this. Eventually they get access to such powerful defensive spells that they can shrug off almost any attack, even despite their cloth armor and pathetic health totals.
 * Also Viconia. Her high agility, low constitution, and lack of a fighter's Hit Die might make her look weak. But she can equip the heaviest of armor (with easy-to-find strength-enhancing gear), and combined with her agility, winds up with a very low (i.e. nearly unhittable) Armor Class. And can equip the Crom Faeyr or Flail of the Ages if need be. Best of all, she also has a drow's resistance to magic, and with a certain cloak, can be immune to nearly all magic attacks as well!
 * In League of Legends, Amumu the Sad Mummy. He's a Yordle, making him about child-sized, but also a tank with a damage reduction ability.
 * Speaking of Yordles, let's not forget Poppy and her ridiculously powerful passive.
 * Lilith from Vanguard Princess. She's the shortest character, but must of her attacks are floor-breaking throws and suplexes.
 * In The Elder Scrolls V Skyrim, create a female Breton of the smallest weight possible and load up on heavy armor and two-handed weapons. Since Bretons are the physically smallest of all of the races you can play as, and female Bretons are even smaller, and you're roaming Skyrim, the land of the enormous, muscular Nords, you're essentially playing a tiny, armor-plated waif of death whose spiked helmet barely comes up to most people's shoulders.
 * Fuka Kazamatsuri of Disgaea 4 a Promise Unforgotten is a skinny middle-school girl with no demonic lineage or combat training. This does not stop her from being the resident Mighty Glacier.
 * - in Mass Effect 3. Sure, she's made of metal, but tech squadmates in this series are generally fairly fragile. She bucks the trend by being nearly as good a tank as James Vega. Her class power is geared towards increasing her shields and health, while two of her active powers are about absorbing / avoiding punishment.

Western Animation

 * Toph from Avatar: The Last Airbender is a little blind girl...but she's also an insanely powerful Earthbender, and sight or not you can't fool her seismic sense. She's also a Boisterous Bruiser.