Yandere and Almost Yandere (Straight)

A yandere that takes it to a new level of creepy/weird.
Seriously, who thinks to do this?

Yandere school doctor.

From now on any rich/royal male lead you read in a shoujo/josei manga is a yandere. Because it seems like they take up most of this genre.

Yandere servant.

Yandere with a leg fetish.

The first 3 chapters are the yandere story. It's of course a yandere best friend hiding his true colors story, but he doesn't go to the extreme like other yanderes. He's still crazy and possessive though.