I can't remember Wich background it was
53 days ago (-1)
Spoilers for anyone who is trying to figure out how to get the characters without help:
Too get the new characters you have to try the pumpkin head on enderwoman, bee and so on (haven't figured out the rest yet) and you wait a few seconds or you use the piston with the said character with pumpkin on head. Here is proof of my progress.