ZZZ Isekai: Anti-Hero Collection

Protagonist: OP
Evil: ★★★★★ (Hateful, Twisted)
Isekai: Second Chance (turned back time)
Setting: Fantasy RPG
Plot: Betrayal & Revenge
Features: Ability System
Warning: Murder, Rape, Torture, Brainwashing

Protagonist: OP
Evil: ★★★★★ (Hateful, Twisted)
Isekai: Second Chance (goddess revived him)
Setting: Post-Fantasy RPG
Plot: Betrayal & Revenge

Protagonist: OP
Evil: ★★★★★ (Hateful, Twisted)
Isekai: Second Chance (tutorial mode ended)
Setting: Fantasy RPG
Plot: Betrayal & Revenge
Features: Leveling System
Warning: Murder, Torture

Protagonist: OP, Monster
Evil: ★★★★☆ (Pragmatic, Cunning, but is he even Human anymore? Isn't this just predatory behavior?)
Isekai: Trapped in Game
Setting: Fantasy RPG
Plot: Castle/Kingdom Defense(?)
Warning: Murder (genocide?)

Protagonist: OP, Monster
Evil: ★★★☆☆ (Pragmatic, Cunning)
Isekai: Reincarnated
Setting: Fantasy RPG
Plot: Castle/Kingdom Building
Features: Leveling System
Warning: Harem (but done well), Murder, Cannibalism

Protagonist: OP, Mercenary
Evil: ★★★☆☆ (Pragmatic, Cunning, but it's also self-defense?)
Isekai: Summoned
Setting: RPG
Plot: Search for a Way Home, Castle/Kingdom Defense(?)
Warning: Murder

Protagonist: OP
Evil: ★★★☆☆ (Pragmatic, Cunning?, Spiteful)
Isekai: Summoned
Setting: Fantasy RPG
Plot: Weak-to-Strong, Betrayal & Revenge, Search for a Way Home
Features: Ability System
Warning: Harem

Protagonist: OP
Evil: ★★☆☆☆ (Pragmatic?, Spiteful)
Isekai: Summoned
Setting: Fantasy RPG
Plot: Revenge(?), Castle/Kingdom Building
Features: Leveling System
Warning: Semi-Harem

Protagonist: OP, Monster
Evil: ★☆☆☆☆ (Pragmatic, but he's a Cinnamon Roll)
Isekai: Reincarnated
Setting: Fantasy RPG
Plot: Castle/Kingdom Building
Features: Evolving Mobs
*ACTION more than ANTI-HERO*