For my ideas, I've had one for canon characters where Danny and Taylor both trigger at the same time resulting in multi-trigger powers. For OCs ideas, I have none, but I like yours.
I like these two in particular:
A hero is seduced to villainy after being pushed to the edge one too many times...
I'm interested in
Best friend x Best Friend
Witch x Witch Hunter
Gamer x Gamer
Step Sibling x Step Sibling
Crime lord's daughter x Rival gang member
School President x Failing Grades Student
Yandere is a term in Anime. Yan means "Lover" and Dere means "Psychotic" or something like that, I can't remember exactly, but it's something along those lines.
Yandere characters are basically OBSESSED with one person, that they just deem their own, as if they were in a relationship. Yandere...