History Awesome / HighSchoolDxD

** The sheer CatharsisFactor of Issei's NoHoldsBarredBeatdown on Diodora in the anime - Issei gut-punches him hard enough to cough up blood, smashes his face in, Boosts himself roughly ''thirty times'' to overcome a barrier and uppercut him into the ceiling, and adds ''another twenty'' Boosts onto that for their final 'struggle'. Said struggle being Dragon Shot vs everything Diodora had... Dragon Shot pierced through in a ''millisecond, destroyed the wall inches from his face, and leveled a mountain-sized landmark in the process.''

** [[SerialEscalation Then Issei's (incomplete) Juggernaut Drive powered up 100+ Boosts for it's ultimate attack,]] [[ChestBlaster Longinus Smasher]] [[note]] 1.3 Nonillion (10-to-30th power), at the very least [[/note]]. [[HolyShitQuotient And not only is Issei getting stronger, the strongest enemies in-story - Ophis and Great Red - could destroy Juggernaut Drive with ''fractions'' of their full power.]]

*** This is an impressive feat, made more impressive by the fact that his power increased 34.3 BILLION times his normal.
%% For further reference, the exact total wound up being 34,359,738,368 times normal power.

* 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 Issei to apply Dress Break on them.

[[AC: Group]]
* The first episode of the third season showcases what Tannin can do against the crew. Let's just say them getting curb stomped is an {{Understatement}}. And according to Ddraig, he wasn't even using ''a tenth'' of his power when he tested them.

* Using a combination of [[DualWielding Durandal and Ascalon]], she kills two of Diodora's Rooks via ''PillarOfLight'', in the shape of a SwordBeam at that.

** The sheer CatharsisFactor of Issei's CurbStompBattle with Diodora in the anime - Issei gut-punches him hard enough to cough up blood, smashes his face in, Boosts himself roughly ''thirty times'' to overcome a barrier and uppercut him into the ceiling, and adds ''another twenty'' Boosts onto that for their final 'struggle'. Said struggle being Dragon Shot vs everything Diodora had... Dragon Shot pierced through in a ''millisecond, destroyed the wall inches from his face, and leveled a mountain-sized landmark in the process.''

** He gets two in the sixth volume. [[spoiler:Two of them [[CurbStompBattle curb-stomping both enemies]] when both decided to insult Issei's friends.]]
*** Also frees Asia from becoming a nuke to wipe out the entire leaders of the three factions by [[spoiler:''applying ClothingDamage'' to her. Yes, ClothingDamage as an awesome moment; found only in this series.]]

-->'''Issei:''' Respond to what I'm feeling and do your worst!
-->'''Ddraig:''' ''Vanishing Dragon! Power is Taken!''

* In the anime, during his fight with Kokabiel, he uses dual swords that the Fallen Angel blocks, mocking him about how weak he is. Kiba claims [[BadassBoast he's not done yet and produces a third sword]], ''and uses it with his'' '''teeth''', managing to make him bleed. For the dub, the moment is similarly awesome with Kokabiel taunting him 'Give up yet?', and Kiba responds with [[Determiner 'Never!']] before cutting the Fallen Angel.

* [[spoiler: She destroys everything BUT ''half of Grendel's face'' in volume 16! Grendel gets one for ''surviving that''.]]
** In the anime, Rias killing off three fallen angels 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 [[ManipulativeBitch Raynare]].

** And before that, [[KickTheSonOfABitch both times he punched Freed in the face]]. He had those coming.
** Then in Episode 10, ''he breaks Mira's staff with his'' '''bare human hand'''. It hurt him a little, but that makes it no less awesome.

*** ''Fully'' animated in all of it's glory!
*** The ''entire'' TransformationSequence could count as an [[http://www.youtube.com/watch?v=oOB5whBRFaY&feature=related awesome moment for the studio.]] It must be seen to be believed.

*** The real awesome moment was when he ''absorbed Albion's powers'', which Ddraig stated that it was a MillionToOneChance of it happening because Albion's powers work against Ddraig's. But with the combination of Issei and Ddraig's resolve being in perfect sync, they achieve it, and [[ThisCannotBe Albion is in complete shock as a result.]]
*** Meta example: The fact that Creator/FumihikoTachiki actually got to shout Boost non-stop for ''12 seconds without running out of breath'' is just awesome. And not only him; Creator/ChristopherSabat as well for the dub's version.

* Oh, and he gets to solve ''all'' of his club members' DarkAndTroubledPast baggage, something Sona notes as an accomplishment.
* [[spoiler:Befriending ''and'' becoming the son of both Great Red ''and'' Ophis, ''two of the strongest beings of the entire series'' counts as this.]]
* In Volume 14, he borrowed a page of awesome from [[Manga/OnePiece Luffy.]] Specifically by [[spoiler: making his right hand turn into a dragon by extending it and punches a magician who has a high level barrier with ease.]]

* Volume 17 gives us [[spoiler: Issei's full powered AttackDrones by combining both Red and White wyvern powers and manages to corner Euclid with it.]]

* After getting some sprinkles of badassery in volume 16 and 17, his new ability, Penetrate, more than makes up for it. [[spoiler: He ''literally beats the crap out of Rizevim who can't nullify Penetrate'']].

** During his fight with Kokabiel, he uses dual swords that the Fallen Angel blocks, mocking him about how weak he is. Kiba claims [[BadassBoast he's not done yet and produces a third sword]], ''and uses it with his'' '''TEETH''', managing to make him bleed.

** 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 [[ManipulativeBitch Raynare]].

** The first OVA shows us what happens when Issei uses Gift on Rias. [[ThereIsNoKillLikeOverkill Damn...]]

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

* The first episode of the third season showcases what Tannin can do against the crew. Let's just say them getting curb stomped is an {{Understatement}}. And according to Ddraig, he wasn't even using ''a tenth'' of his power when he tested them.
* The sheer CatharsisFactor of Issei's CurbStompBattle with Diodora in the anime - Issei gut-punches him hard enough to cough up blood, smashes his face in, Boosts himself roughly ''thirty times'' to overcome a barrier and uppercut him into the ceiling, and adds ''another twenty'' Boosts onto that for their final 'struggle'. Said struggle being Dragon Shot vs everything Diodora had... Dragon Shot pierced through in a ''millisecond, destroyed the wall inches from his face, and leveled a mountain-sized landmark in the process.''

* The first episode of the third season showcases what Tannin can do against the crew. Let's just say them getting curb stomped is an {{Understatement}}. And according to Ddraig, he wasn't even using ''a tenth'' of his power when he tested them.

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

** Vol 5 has Issei learn to activate his full Balance Breaker on his own, and uses it to own Kuroka, preventing her from taking Koneko. The anime shows this well: with one punch, he ''annihilated' the entire area behind Kuroka, without touching her at all - and the only reason she was spared was because he was allowing it. Should she cross them again, however, he makes clear that he wouldn't hold back.

** Vol 5 has Issei learn to activate BB on his own, and uses it to own Kuroka, preventing her from taking Koneko.

* I have three words for you: ''[[spoiler: Malebolge Vritra Promotion]]''.

*** Meta example: The fact that Creator/FumihikoTachiki actually got to shout Boost non-stop for ''12 seconds without running out of breath'' is just awesome. And only him; Creator/ChristopherSabat as well for the dub's version.

*** Meta example: The fact that Creator/FumihikoTachiki actually got to shout Boost non-stop for ''12 seconds without running out of breathe'' is just awesome.

*** The real awesome moment was when he ''absorbed Albion's powers'' which Ddraig stated that it was a MillionToOneChance of it happening because Albion's powers work against Ddraig's.

HighSchoolDxD more or less runs on RuleOfCool, so there are a lot of these