Has a similar plot to an otome game. The MC isn't passively peaceful like other characters, she is not afraid to show her anger at the betrayal.
Horrible ML
Villainess
Based on novel instead of otome game, but similar enough plot to be included on this list.
MC wants to change her bad ending and live peacefully.
Early marriage
Villainess
.
Villainess
Not an isekai, but otherwise fits on this list.
Yulia notices that the world around her is starting to follow a series of novels that her shop is publishing. She works gathering proof of her fiance cheating with the FL, and avoiding so call acts of bullying.
Villainess
Not based on otome game but similar style plot enough to be added to this list.
Over weight male MC tries to avoid bad ending in a magic school harem shounen anime.
Side character
Not an isekai, but otherwise fits on this list.
Narrator
Based on novel instead of otome game, but similar enough plot to be included on this list.
Reincarnated as the villainess of darkness in a fantasy world.I
Villainess
Based on novel instead of otome game, but similar enough plot to be included on this list.
Side Character
Webtoon
.
Side Character
After getting publicity executed MC is sent back in time. Aria desides to improve herself in order to avoid the same fate and get revenge by becoming a true villainess.
Villainess
Messages
You've found a nice selection here! (≧∀≦)