Toriyama finds a style motif and sticks with it for a while.
in the android saga, all the new haracters had the same hairstyle and now he's doing the emaciated guy/tubby guy dichotomy with Gotenks and Buu
honestly, there's Pirate King, Hokage, demon king, science king, shaman king
but wizard king is where i draw the line. i haven't seen one second of this show and I already don't care