LB - Last Breath... if he is hit he will survive because of Gaster 
Hardmode - Very intense sans but he is a big thinker
KAB (Karmas a B1#ch) - he can use act and do some stuff that I don't really know 
Dust - killed his brother papyrus and his ghost can appear when dust needs papyrus... Dust also talks to papyrus... 
Insane - killee papyrus but was locked up before when he killed papyrus he went insane and carries the head of papyrus with him... the head also has a subconscious of its own