Underfell Sans looks very similar to his Undertale counterpart.
Lives in the underground with the other monsters.
Is bossed around alot by his younger brother, Papyrus, who forces Sans to call him "boss".
Sometimes abused mentally and physically by Papyrus if his job isn't done correctly.
Has the ability to summon gaster blasters to shoot at his opponent.
Has the ability to summon bones to shoot at his opponent.
His eyes glow red when he's using his magic, though he tends to keep them red.