I don't know why I didn't even think of Vegeto. He would easily be the coolest looking character in the game. Which is saying a lot, since they such a good job on Trunks, Gohan, Cell, 18, and Piccolo. Well, everyone really, but you get the point. And he has unique moves to him, like the Sword Arm, Fingerbeams, and even his own variation of Chun-Li's kicks. On top of some moves being an amalgamation of Goku and Vegeta's standard toolset. Like Instant Transmission, or Vegeta's Rising Knee that's in most 2D DBZ games.
If movie characters are in, it'll likely be Broly/Bardock >>> Janemba >> Cooler >>> Bojack >>> The rest. If somehow Turles and Dr.Wheelo are chosen over them, I'll enter the legnendary Super Saltian form. Janemba and Broly would be the most unique I feel.
I agree that ToP characters will probably be DLC. Instead of Califla and Kale, Kefla would/should probably be chosen, for the same reason Gotenks was over Trunks/Goten. That would also stop Broly from having a redundant counterpart. Jiren, and maybe Toppo too, but they honestly are just straight up strong, and don't offer a ton of moves so far. Ribrianne or however you spell it would offer more moveset wise from what we saw so far, and could have her two sidekicks for assist moves, even if no one likes them. There's also Trio de Dangers, who as a unit have shown some gimmicks, and each have solo gimmicks. Though they ain't popular. Katopelsa would still be better than most ToP opponents.
GT would also likely be DLC, that I can agree with. But who, and how many would be the tricky part. As much as people don't like GT, me included, some will still want to see the characters. Omega Shenron would be the most obvious, Pan, as annoying as she was on the show has a shot. Either Baby or Uub also having an okay chance. And that's not going into the SS4 characters.