Majin Goku
In dragon ball GT and dragon ball AF
they will turn into gokan
Nope.
Goku became a boy due to the power of the black star dragon ball
Never Goku never turns into a dragon. And if your referring to Azorru, he never turns into one of them either, but if your talking about ssj 4 In Dragonball gt.
he did turn super saiyan in the last episode of the dragon ball series where he went out to look for the dragon balls because his grandmother was sick. And met his great grand father Goku.
when the dragon ball went inside goku that means he is the new guardian of the dragon balls and he became stronger because the dragon balls has sheron power maybe he can turn to a super sayian 5.
Nope. But Pilaf did in Dragon Ball GT, you can read about it on Dragon Ball Wiki if you want.
Dragon Ball Z Kai episode 47
with both actually but you have to unlock that move
yes goku does turn super sayian 5 in dragon ball AF which is only on in japan right now the only reason i know this is because its on you tube