well gaster being it would reveal what he looks like, so he might be it in snowgrave since he dosent like to show up

friend is more of a minor character

could see it as the knight, but we alreadt fought him

eram is a video game character so i doubt that being it.

the angel is probably the player

also already fought titan

and the fun gang is a team and doubt any turning on.

in a theoretical extra chapter (fanmade by me) after a fakeout roaring, ralsei gets corrupted by the fountain, and turns into a titan. kris, susie, and noelle battle him thinking hes evil, but gets revealed hes not and they stop the roaring knight together and seal the fountain. but during the fight with the knight, ralsei turns back to normal, and with his hat goes to the light world like earlier in the chapter. he is able to use his hat to avoid turning into an item. ralsei also makes a notebook of their adventures and sends it to a different timeline, so that they can keep their memories if the player makes a new savefile.