here's how to unlock every new Halloween character:
equip pumpkin mask on a girl from this list and select location with candles, then finish inside her once (if you accidentaly swapped someone's head, then yo can easily reset it be rejoining in the game)
Hornet- bee girl
Cult of the Lamb protagonist- sheep girl
Pumpkin cat from Fortnite- regular pumpkin (dont forget to equip pumpin hat on it as well to make the ritual right)
Scp-1471- (i forgot) Enderwoman, iirc...
(I wonder if you can turn skeleton into something aswell, cuz idk how)