Oof, scientists are so fun ;w; I have a weakness for mad scientists and doctors but The Dollmaker and Doctor H. Beat are the first two that come to mind!
The Dollmaker is a mad scientist obsessed with his power to bring any stuffed animal he makes, any object he sews, function like a living organism. He often experiments on himself by cutting off parts of his body and sewing them back with fabric to see the effects, and carries around a bag of nearly finished creatures to attack and mutilate people.
Doctor H. Beat is a super paranoid surgeon who believes everything can be explained logically, no matter the cause, and is terrified of being killed in his line of work. He takes EXTREME precautions so he'll be sure his patients don't hurt him and his room is full of rambling notes over every patient he's ever had in the prison he works in.