How about just "Boo", it's very on theme for the whole sheet over the head thing.
I also thought of doing the same thing by naming it "BOO". Apart from that making sprites is so hard the only sprite took me about three to 4 days just for the base model creation at the same time i have issues with making animation and knockdown frames for the sprite i made. Since it was my first time working with aseprite also i have never worked on anything based on this kind of stuff at all . It might take a lot of time but i will do my best guys