MS Paint World: Back Off Man, I'm a Scientist

From A Ninja and an Assassin Under One Roof, it's Marin Iztsumi, the jealous scientist assassin! A self-proclaimed rival to the assassin of the show's title, Konoha, she kidnaps the ninja of the show's title, Sataoko, and replaces her with a robot duplicate that looks exactly the same (except for the laser eyes, and the Mazinger-style rocket arms, and... Look, she just made her based on vibes) to get Satoko to work for her. She's one of the few characters introduced after the first episode not to be murdered by Konoha, she's lucky to be here! She's a pretty fun character though, as you can tell. Extremely gremlin-like, very impish, nice teeth, 10/10, no notes.