Disbelief papyrus

the best character in the game of course is disbelief papyrus.

he can summon undyne the undying. he can summon hurt sans. and with him you can unlock Undyne the undying and hurt sans as a skin.

he can shoot bones and use gaster blasters and for is skin and character all you need to do is play as the papyrus skin (for disbelief papyrus skin) or the papyrus character (for disbelief character) and die 3 times.

1.5 beta

Disbelief papyrus returns, but its more complicated to get him now. After grinding away and beating Hard 3, challenges are unlocked. After getting the disbelief skin and music, beat the Speed challenge (and of course all the ones before it; it is not the first one). Obviously you have to use papyrus.