Goku
ok i've only seen the first couple episodes of Saiyuki, and Goku reminded me alot like Goku from the Dragon Ball series here are some examples:
1) Name
2) They both have a pole that gets bigger for a weapon
3) Hair is similar
4) They love Food
5) They can both change into stronger versions of them selves
if anyone has any other similarities just say so
like i said i've only seen a couple of the episodes so i dont know if Goku(Saiyuki) changes at all