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Demon King Koro-Sensei
The Demon King and teacher of Class E
- Adaptational Heroism: This version starts out as a hero rather than a cold blooded assassin.
- Adaptation Species Change: He is a demon in this version rather than a mutated human.
- Subverted partly is that he is a mutated human but played straight in that his mutation is the result of demonic power rather than a lab experiment.
- Dark Is Not Evil: For a Demon King in dark clothing he does show some noble qualities in saving his students from harm.
- Demon Lords and Archdevils: He is the Demon King afterall but not the ones being described by Karasuma
- Evil Overlord: What most of the monsters think of him, But not so much evil
- Fallen Hero: Korosensei this time around was a renowned hero, but after killing so many monsters, he lost his motivation and became the Demon King for kicks. Of course, he got bored of that real quick, and now he's teaching would-be heroes to kill him, so he can find someone to give him a challenge.
- Dark Is Not Evil: His clothes and hair are dark, but is also one of the most heroic characters.
Main protagonist and student of Class E.
- Awesome, but Impractical: His bug. Needs to defeat a board of monsters? Strength goes up to 9999, but gets a comically muscular body. Needs to save his class from imminent death? Rewinds time... all the way back to the beginning.
- Bishounen: Just look at the kid.
- Cursed with Awesome: His bug causes a random effect whenever he uses it. Usually useful with some unnecessarily comical side-effects.
- Distressed Dude: Pretty much a damsel in distress. He is literally kidnapped and dressed up as a princess by Takaoka.
- Dragged into Drag: Very, very often. Unfortunately for him, usually Played for Laughs.
- Eyes Are Mental: When switched with Karma his eyes stay shiny.
- "Freaky Friday" Flip: With Karma in episode 8. He doesn't seem to have any major problems with it until Karma decides to have some fun.
- Non-Action Guy: He usually stays out of the fights and isn't strong enough to resist Nakamura and Karma dressing him up as a princess. He does have his moments, though.
- Useless Super Powers: Played with. His bug is one of the more useful ones in the class. That is a relative term, however.
One of the protagonists and part of the legendary Three Heroes.
- The Ace: Karma is one of the Three Heroes (him, Ritsu and Itona). He's shown to be skilled with swords, traps and magic. He is considerably stronger than the majority of Class E.
- Adaptational Heroism: Played with. This version is less violent than in the original series. In fact, he doesn't contribute much to the violence in most episodes.
- Butt-Monkey: There's a running gag where nearly whenever he talks he gets hit in the head by a wahsbin. It even happens when he isn't talking.
- Awesome Mccool Name: His name's Karma Akabane. He's also called the Red Devil. Enough said.
- Blessed with Suck: His bug's only usage gets him hit in the head, dropped into a pitfall trap or hit hard enough to send him flying.
- Dark Is Evil: Just look at his debut outfit. He's pretty much your typical villain.
- Deadpan Snarker: He is often sarcastic and contemptful. Subsequently, it activates his bug.
- Evil Is Cool: He intially had a dungeon complete with traps, monsters (even slightly-smutty ones) and an overall pretty cool setting. He even had his own, unique outfit. The heroes only have regular middle-school uniforms with beige capes and below-par supplies.
- Eyes Are Mental: As Nagisa, his eyes still lack the typical highlight.
- Evil Overlord: In his debut he has a whole dungeon plus a hoard of monsters all to himself. One could wonder why he joined Class E.
- "Freaky Friday" Flip: In episode 8, the class swaps bodies. He and Nagisa switch places, so left with a feminine body, he takes the opportunity to wear girls-only bikini armour for the lulz.
- I Shall Taunt You: Every. Single. Line.
- HeelFace Turn: In episode 2 he is introduced as pretty much an outright villain with no intention of joining Class E. After some words from Korosensei, he 'willingly' joins the group and 'stops' being evil.
- Lighter and Softer: This Karma doesn't come with the emotional baggage he has in the original series and never tries to commit suicide.
- Useless Super Powers: His bug is officially an 'irregularity with [his] luck stat'. Irregular is putting it mildly. If he acts cocky or contemptful, it immediately drops to the point that he gets randomly hit with objects. Even worse, probably ninety percent of his lines are him belittling someone.
- Villainous Fashion Sense: He is introduced wearing a purple, long-sleeved shirt with black pants, black and white shoes and a very sinister black cape.
One of the protagonists and part of Class E.
- A-Cup Angst: Is very defensive about her small chest. When bodyswapped with Yada and finally having large breasts, she announces she is never going to swap back.
- Adaptational Heroism: Kayano never gains tentacles like she does in the original series.
- Damsel in Distress: Kayano eats cursed pudding and falls into a permanent coma unless a princess kisses her.
- Lighter and Softer: In this version, her sister never died, so she isn't as mentally unstable as her main-series counterpart.
- Fighter, Mage, Thief: Almost literally the Mage to Nagisa's Thief and Karma's Fighter.
- Adaptational Villainy: This version has no problem harming Class E.
The main antasgonist of the series.
- Adaptational Heroism: Downplayed, while he is still a bad guy, this incarnation never used poison to kill a student, but used a sleeping potion.