Ainx Ooal Gown

While Ainz is a cautious and stingy person, he will always try to plan ahead and control details beforehand in order to avoid any haphazard actions that can endanger Nazarick's existence. He takes satisfaction from experimenting with his powers by measuring the extent of it to the point where he heartlessly brainwashes and kills people. whilst also having new ways to kill people such as crushed, or broken bones, he does something new every time he kills someone. You just happen to be a new Overlord (you can do your character freely, I'm not stopping you)