I know, I'm not an user of this wiki, but I had to say it, but first of all: Sorry if my english is bad. ;p
From franchises already in the game: Flash from DC, Zygon and Missy (and her other incarnations) from Doctor Who and Glinda from Wizard of Oz... New in the game? Harry Potter, someone from a non-Disney adaptation of Alice in Wonderland, and... Beetlejuice, Beetlejuice, BEETLEJUICE!!!.
Obviously it's impossible, but I had to say it, I would like Beetlejuice in the game.