Well, I think that krillin is already enough for the humans. Master Roshi would have to be beefed up alot, and that would make it alot more unrealistic, in dbz standards.
He might have 1 transformation at most, but then he'd be left in the dust when more transformations are added to esf. I think he'd be a bad addition to ESF. Maybe someone can make a mod with all the characters in
DBZ. But untill then, play as Krillin
.
Perhaps, someone could make a Master Roshi skin for Krillin *wink*, but unless someone does that, dont get your hopes up.