I found this list on Tumblr and this apparently is a LEAKED list of the 21 remaining characters to be announced:
Phantom Blood Dio Brando
Battle Tendency Lisa Lisa, Cars
Stardust Crusaders Iggy, Vanilla Ice
Diamond is Unbreakable Rohan
Vento Aureo Bruno, Narancia, Abbachio, Fugo, Trish, Ciaccolata, Ghiaccio, Risotto, Diavolo(CC2 loves them some Part 5 http://25.media.tumblr.com/6ea8936749cc5e3c65ba7234a98d68b1/tumblr_mm7qwqNmhc1qdyupno3_r1_500.jpg)
Stone Ocean
Annasui, F.F., Weather Report, Pucci
Steel Ball Run Diego, Valentine
I have to say this list sound pretty believable and I have to say I'm satisfied with the roster(I wish their where more SBR and part 4 characters but OH WELL). I assumed part 3 would have the most characters but DAMN, Vento Aureo!
Tell me what you guys think of this list. It sounds pretty legit to me.