Sans

Sans is a very dangerous and lethal skeleton, just like his brothers. Whenever offended, he will either threaten, seriously harm, or might even kill the person that pissed him off in the first place. Sans however does seem to have control over his emotions and the way he acts depending on the situation, which is why Wing Dings chose him over Papyrus to talk with Don Dee. His brothers are Papyrus and Wing Dings. His brother Wings Dings is the Gaster Don. Him and his brothers are the Gaster brothers. This is Mafiafell Sans.