It's definitely not Goten or Turles, he's most likely not even a saiyan.
Wouldn't make sense for a God of Destruction to call himself Son Goku and be so weak (Goku fights him off as a SSJ2).
The best bet right now is that he's related to Zamasu (the green Kai), and has something to do with the destroyed six universes.
Goku black is not a saiyan.Turles
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:Sparks:
For fusion you need 2 potara earrings. Black has 1.Goku black is not a saiyan.
At least the one in control of the body is not a saiyan.
You could tell as much from how he spoke to Trunks, by saying that a proud warrior race will die by killing Trunks.
Also Goku black has a time ring and a Makaioshin/Kaiohsin Earring.
So its likely that he has something to do with the Makaioshin/Kaioshin or other gods.
A new character Zamasu, who looks a bit like a different color version of Supreme kai, will be introtuded too.
If you look at Goku black his clothing it looks like a fusion between that of Zamasu and Goku.
So who knows.
Where did I talk about full power/ssj2?For fusion you need 2 potara earrings. Black has 1.
Where are you getting the info of him being full power = ssj2 goku?
Old Kai and the witch, Kaishin and Kibito all fused but the Kais regain their looks more. What would make a Black look more saiyan than kai?