I love villain characters

Isekai
Mc tries to prevent her brother from going down a dark path, but instead he runs away. To support her father, she joins the knights in his place and also hides her true strength.

Isekai-vibes but not
Ginger our Mc has a love rival/frenemy and they have the same taste in men. After discovering a book about their destiny (she was villain in book) she decides to steal/be main character now.

Reincarnated empress with mad swordsman ship is sold to a noble who turned into a beast.
She is seen as villainous bc she tamed the beast/ treats him like a dog

Otome Isekai
Penelope Eckart reincarnated as the adopted daughter of Duke Eckart and the villainess of a reverse harem dating sim. The problem is, she entered the game at its hardest difficulty, and no matter what she does, death awaits her at every ending! Before the "real daughter" of Duke Eckart appears, she must choose one of the male leads and reach a happy ending in order to survive.

Time travel?
She Dies bc she was turning into a bad empress and was killed by her most loyal knight and friend. Now she wants to avoid that ending

Isekai
Juniper is originally the villain in the book, but our Mc doesn't want that, so she tried avoiding the original Mc and ML. But she fell in love with him.
!! Spoiler!!
Both the original Mc as well as ML are kinda Yandere for our Mc

Isekai
Mc is sold to villainous king and she's kinda crazy. But he takes a liking to her and tells her to act more villainous to survive by his side

Mc is seen as villainous but is actually perfect noble lady. She married of to a country with a long winter problem

Isekai otome
Mc is villain but she knows the original Mc's 4 admirer are shit. She befriends original Mc who also doesn't like the 4 guys and gets a cute werewolf butler.