Have you tried When A Villainess Loves? Lol
Twins seem pretty 50/50 to me? But mebbe just me. Here are more stories for you where the twins are good kids to each other.
https://www.mangago.zone/read-manga/the_twin_siblings_new_life/
https://www.mangago.zone/read-manga/i_became_the_sister_of_the_time_limited_heroine/
https://www.mangago.zone/read-manga/the_villain_discovered_my_identity/
https://www.mangago.zone/read-manga/ao_no_exorcist/
https://www.mangago.zone/read-manga/the_villain_s_savior/
you did not just recommend "blue exorcist' as a stpry of twins getting along lol
That’s a fair jab, probably. I watched the first season of the anime and read a portion of the manga that followed, not the whole thing. If the relationship changed later, I wouldn’t know. XD
why's there always gotta be an evil twin, why can't there be a pair of twins that love and support each other T-T - signed by a twin lmao