Let's try to keep it realistic, or at least acknowledge when you say something that probably won't happen.
you can post entire rosters that you've made or just toss in one or two you think could work.

that said, the prince of sable from for the frog the bell tolls
as we've seen in the past smash tends to add obscure retro characters in an attempt to revive their franchise or at least get a unique character (pit and ice climbers respectively)
for the frog the bell tolls is actually in the retro game room, so feel free to try it out
a lot of move potential rises from this as well, since in the game he changes between three forms.
the human form would probably have a more medium weight version of Marth's play-style (not a clone though)
the frog form would have greater recovery and all-around survivability, but be very weak
the snake form would be the opposite, a heavy hitter with terrible jump height
if you play to the end there's a very obvious choice for the final smash, but I won't spoil that

You're nearly 5 months late. There's already a thread in the DBZ - SSB forum.

https://www.vizzed.com/boards/thread.php?id=56606

Local Mods : I suppose this needs to be closed for being a dupe. If not, I apologize.

Yeah, it's pretty much the same idea in the older thread, so this can be closed.