If we leave in the fact that you need to be spiritually aware to see him in his Soul Reaper form, then Ichigo would be invisible to Goku, and therefore he would likely win.
But for the sake of this we'll remove that. In this case I believe it would be Goku. He could probably destroy a planet with his little toe in Super Saiyan 4 (which exists). That coupled with the fact that he can use mega-moves like Kamehameha and the Spirit Bomb would probably crush Ichigo even with his Bankai Hollowfication.
At the end of the day I can't really say, but those are my thoughts. It would be interesting though.
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Ichigo, because final getsuga tensho is all powerful and fast. Goku wont stand a chance, not even at Ssj 4.
goku super saiyan would win for sure.
If you talking bout buzz lightyear he will get creamed by Goku.
Yes. The last fight in Dragon Ball Z is between Goku and Uub. Goku goes easy on Uub, but when the latter is enraged, his power is equal to that of Goku (without Super Saiyan, of course).
Because Vegeta was under Babdi's spell and told Goku he would kill more innocent people if Goku didn't fight him.