Goku's projectile spam wouldn't work all that well in smash, since there really wouldn't be all that much to counter it and allow other characters to approach. Ryu worked cuz his hadoukens were discrete balls of energy with travel time. At most, goku's kamehameha would have to work very similarly to Robin's Thoron, since it travels quickly and the whole length of the beam is capable of damage. His teleportation would likely be put in as a counter (think of Greninja's counter). I can see smaller energy ball barrages as being part of his directional throws, like mewtwo's. Or as his down air, which would make him hover in one spot as he delivered his attacks straight down (rather than plunging down like Link). His teleport could be his third jump like mewtwo's, and his counter can be after image like lucario's.
That reminds me, lucario and goku share the same voice actor in English, so there's that.
His jumps would be more like flight, similar to villager's balloons, but faster and smoother but still energy limited- which is similar to rob's, now that I think about it.
He would likely have rage mechanics at higher percents. His super would either be super saiyan/sonic's super, or a big kamehameha/samus's super.
his side special could be solar flare, a short range stun that requires the opponent to be facing you- a better version of mewtwo's confusion.
idk, the more I think about it, the more feasible Goku in smash seems to me.
let them bitch.
We don't need naruto- we have greninja
we don't need ichigo- we have cloud/ike
we don't need goku- we have mewtwo/lucario. shit.
And while popular... they definitely have a different feel to 'em. The limit is and always will be whatever the devs feel like, and they've surprised us quite a bit in the past.