Highschool DxD/Awesome

High School DxD more or less runs on Rule of Cool, so there are a lot of these

Issei

 * Seeing as Issei is the protagonist of the series, he's bound to at least have one per volume.
 * He starts off his chain of awesome with defeating Reynalle with his first real use of the Boosted Gear.
 * He gets his second big one when he crashes Raiser and Rias wedding. Considering that Raiser has been a Jerkass the entire volume, seeing Ise use Balance Breaker for the first time to pound his face in, then use his newly dragonified arm to use a cross and holy water against Raiser was sweet vindication.
 * He's running on borrowed time too when he fights him.
 * Fully animated in all of it's glory!
 * The entire Transformation Sequence could count as an awesome moment for the studio. It must be seen to be believed.
 * In volume three, he gives and epic Shut UP, Hannibal at Kokabiel when the latter tries tempting him to join the fallen angels.
 * The fourth one gets him to curb stomp his rival in the series when the latter pushes his Berserk Button. Though it was obvious that Vali was definitely holding back against him.
 * Vol 5 has Ise learn to activate BB on his own, and uses it to own Kuroka, preventing her from taking Koneko.
 * He also unveils Billingual, and tears Sona Sitri's plan to pieces.
 * He gets two in the sixth volume.
 * Also frees Asia from becoming a nuke to wipe out the entire leaders of the three factions by
 * In the seventh volume, he gets
 * In volume nine, the party is losing to the Hero Faction, and Kunou's mom is about to be used to summon Great Red.
 * Volume 10:  Probably the most HSQ fight of the entire series, comparable to Negi VS Rakan fight.
 * To put this into perspective, the author was itching to write this fight.
 * Can't forget how he fights off his predecessors Madness Mantra to activate  by making up a Badass Creed on the spot..'
 * Volume 12:
 * Oh, and he gets to solve all of his club members Dark and Troubled Past baggage, something Souna notes as an accomplishment.

Kiba

 * He gets an overall one for actually being able to keep up with Ise throughout the series.
 * He is the first in Rias' group to reach Balance Breaker, and it lets him make holy-demonic swords. Which can't actually exist in reality.
 * It later turns out he acquired a SECOND sacred gear at the same time. Which is at Balance Breaker the first time he uses it.
 * He one-shots  Ise notes he even was jealous of Kiba's cool moment.
 * Defeats Siegfried in their second match by ]]
 * Gains an Offscreen Moment of Awesome in volume 12

Rias

 * Her nickname is Crimson-Haired Ruin Princess. What did you expect?
 * In the first volume, she kills three fallen angels. OFF SCREEN.
 * In the Anime it happens on screen, and it is awesome, She kills all three at the same time with a single attack.
 * And then completes the set by vaporizing Reynalle.
 * In vol 6, she and Akeno get in an argument over  When the enemy tries to interrupt, the girls deliver a twin Offhand Backhand for their troubles, taking out all three of the attacker at once.

Asia

 * Being The Medic, she doesn't have a lot of these, but the ones she does have are pretty sweet.
 * She normally stays pretty calm, regardless of the situation, but when Diodora insults Ise, she slaps him across the face.

Akeno

 * She is Rias' Queen, and the daughter of a Fallen Angel. She is also a sadist.
 * Any use of her holy lightning qualifies.
 * The above stated Offhand Backhand with Rias against three enemies at once. While having a Cat Fight with the latter.
 * Another one is her.

Azazel

 * What exactly did you expect from the leader of the fallen angels anyway?
 * In volume 4, Katreya has his arm wrapped around in tentacles and will blow him up if he doesn't get rid of it. The problem is that the tentacles themselves are invulnerable to damage so what does he do? He rips out his arm and impales Katreya with his spear.
 * In volume 5, Azazel teaches Issei what it takes to become a first rate pervert, subverting the usual Hot Springs Episode cliches.
 * Going one-on-one against

Gasper

 * He gets to show off his power combined with drinking dragon blood at the climax of volume 4 when he stops time and drains his enemies magic, allowing Ise to apply dress break on them.
 * In Volume 12,

Xenovia

 * Killing two of Diodora's Rooks via Pillar of Light definitely counts.

The other characters (can't leave out the other characters now can't we?)

 * Vali curb stomping Kokabiel counts as one when the Gremory group at that time can't even faze the latter.
 * Later, he goes one on one against Fenrir, a wolf that can kill a god. He wins and subdues it.
 * Odin's fight against a number of devils. He just casually taps his staff and they all die.
 * Sirzechs shows off how powerful the Power of Destruction is on a small scale instead of how Rias uses hers. He just puts a small ball of his power on Asmodeus mouth and kills him from the inside.
 * Souna almost winning against Rias in their Rating Game when she takes advantage of the rules stacked against the Gremory group in her favor. She almost could've won too if it weren't for Ise's new ability.
 * Saji gets one for being able to keep a single thread alive and attached to Ise before getting taken out of the game counts one as well. To the point, Odin praised him and was awarded the MVP of the game.
 * The original Son Goku shows up right as Ise finishes pounding Cao Cao. He proceeds to level the rest of the Hero faction in seconds, and blocks the True Longius, the strongest weapon in the series, with one finger. What.
 * Forget that, Balance Breaker to everybody! Free-for-all no rules, all out fights!
 * He may be a villain at this point but,
 * Sirzechs in Volume 12. Oh boy,
 * His pal, Ajuka, also gets to be awesome in this volume and proving why he's The Rival to Sirzechs.
 * Any match versus Sairaorg will almost always end in a Curb Stomp Battle. This includes  It's always awesome.