Otto would be a truly terrifying yandere tbh. There's just no getting away from him, whether metaphorically or literally.
Mans has seemingly infinite money, is the Overseer of Schiksal, and is a master manipulator. He has people like Rita who will do anything he says. And in that one episode of Cooking with Valkyries he used the body of a young boy to spy on Theresa.
Do I even need to bring up the events of Thus Spoke Apocalypse?
You could literally die/commit suicide and he'd find a way to clone you like he did with Kallen. He is never giving up, either.
They are so sweet, they make me sick