Underswap Sans is flamboyant, excitable, loving, and enjoys making tacos.He is also quite kind to others.he likes to say "MWEH HEH HEH.He still enjoys making puns.He also likes riddles instead of puzzles.He will often refer to himself as the 'Magnificent Sans.and dislikes it when Papyrus makes fun of it.he hate mean people.He is shown to love Papyrus brotherly despite nagging about his laziness often.he dont like mean people. he is work with dream and ink.he use gaster blaster and bones attacks.