Isekai where the Heroine isn’t bad or antagonistic

• World: fairytale
• Protag’s role: antagonist
• Relationship w/ Heroine: stepmother
• I recommend it

• World: novel
• Protag’s role: antagonist
• Relationship w/ Heroine: acquaintance; friend
• Completed

• World: novel
• Protag’s role: villainess/supporting character
• Relationship w/ Heroine: rival; friend
• Completed

• World: N/A; stereotypical school life harem setting
• Protag’s role: supporting character
• Relationship w/ Heroine: best friend
• I’m including this despite her not transmigrating into an existing story because it’s in a story-like world
• Looks good but I’ve yet to read it

• World: novel
• Protag’s role: supporting character
• Relationship w/ Heroine: twin sister

• World: novel
• Protag’s role: supporting character
• Relationship w/ Heroine: younger sister

• World: novel
• Protag’s role: extra
• Relationship w/ Heroine: love interest
• TW: abuse
• Completed

• World: otoge
• Protag’s role: supporting character
• Relationship w/ Heroine: friends
• TW: violence against a child; sexual assault
• Just in case you find it annoying: this is one of those stories where every single couple is queer lol

• World: otoge
• Protag’s role: antagonist
• Relationship w/ Heroine: friends

• World: otoge
• Protag’s role: villainess
• Relationship w/ Heroine: friends? (Idk for sure, but based on the description and promo)