Um, Goku's voice, Gohan's voice, Goten's voice, are all done by the same -woman.-
Apparently you don't know what the hell you're talking about.
Anyway..
The Japanese Pack for ESF 1.2 is pretty lousy. No offense. :/
The sounds aren't very high quality, there's a certain tinny, echoey effect, and some of them simply don't match--a character will finish transforming and he'll still be babbling away.