How many yanderes (male and female) can you list ?

Oh, jeez... I've got a few?

Mikaela Hyakuya (Owari no Seraph)
Shion Sonozaki (Higurashi: When They Cry)
Yuno Gasai (Future Diary)
Hermione de Borromeo (Romeo x Juliet) [kind of...?]
Nagito Komaeda (Dangan Ronpa 2)

for right now

Toma (Amnesia)
Rolo (Code geass)

Nora (Noragami)