W.D. Gaster

Gaster was the royal scientist of the monster Kingdom but then suddenly poof he disappeared fell into his own creation then was replaced by Alphys but anyway Gaster is the single father of Sans and Papyrus and wears a black suit and is a skeleton but has a crack going up on his right eye and a crack going down on his left eye and a large wide smile and fun fact he can summon hands whenever he wants.