Dust is probably the leader.He killed His brother,Papyrus and all His Friends to stop the human but he failed.He covers His head with a hood,he is mostly sad.Halucinates a version of His brother.
Killer,like Dust killed His brother and His Friends,but multiple times.He likes Cats,is Funny and is obsessed with anime.His weapon is knife.Horror,didn’t ate anything in 7 years,Horrortale,creepy look,Undyne gave him a hole in the head,can act kind,the least murderous of all.Weapon=axe.