Janemba: If Janemba were to be added to the game I think it would be awesome if he played similarly too Gargos from Killer Instinct. I mean in the way Gargos has a portal punch and can change between being a zoner or rush down character. It fits the type of character that Janemba is.
Piccolo: While we have already heard about Piccolo and his “technical” play style but it would be pretty cool if he played similarly to Kan - Ra from Killer Instinct. You can use small scatter shots to be traps like Kan - Ra’s bugs while you can utilize Piccolo’s stretched arms like Kan - Ra’s bandages.
Broly: lets get it out there everyone will want Broly over Kale plain and simple. Broly should be a hard hitting Grappler character. Being a grappler character fits a lot of the references thay could be made for him and fits him way to perfectly. Like in the movies there should be a way where a short period of time moves do not affect him in stopping or stunning but still cause damage similar to Gargos’ s Instinct. This would be the fix to getting him in without being a combination rush down character, as I believe he would be a slow moving character.
Cooler: Cooler should be a grappling rush down character. His death beam eyes could be an anti air, Sauzer blade a rush down combo ender. He could use death beam to keep people away while he charges and he can use his grapple move that he used in the first movie against Goku when he transformed. Or for those that know the abridge series, it is the move he uses when he says “Im gonna plant me a dumbass tree”.
I know I used a good number of Killer Instinct references when describing some of these fight styles but truly feel that they would be best and fit the characters in the ways I described above. If you have anything you wanna add, change, agree or disagree with let me know. After all this is only my opinion.