Super Dragon Ball Heroes anime posted some new info on it characters. From the reason why we have 2 Gokus(With one being from another dimension and can go Super Saiyan 4) to the big enemy of the series who strength is too much for anyone. And he is still restrained. Here you are.
Goku
VA: Masako Nozawa
A kind-hearted Saiyan who is training every day to be the strongest. He heads to the Prison Planet where Trunks has supposedly been taken.
Vegeta
VA: Ryō Horikawa
In order to rescue his son Trunks (who returned from the future), he resolves to head to the Prison Planet. He’s suspicious of the mysterious man “Fu”.
Future Trunks
VA: Takeshi Kusao
He came from the future to receive training from Goku and the others on Beerus’ planet, but has now been imprisoned by somebody on the mysterious Prison Planet.
Mai
VA: Eiko Yamada
Came from the future with Trunks. On Beerus’ planet she cooks and does other things to help with the training, but when she learns Trunks has been imprisoned on the Prison Planet, she heads there despite knowing the risks.
Goku: Xeno
VA: Masako Nozawa
A Son Goku from another dimension who works for the Time Patrol. He seems to be investigating the Prison Planet, but…
Fu
VA: Kappei Yamaguchi
A mysterious man who brings news that Trunks has been taken to the Prison Planet. Though he claims to be Trunks’ friend, his true identity is unknown. His aloof personality makes it difficult to tell what he’s thinking.
Cooler
VA: Ryūsei Nakao
Teams up with Trunks in order to escape from the Prison Planet.
The Evil Saiyan
VA: Rikiya Koyama
A mysterious warrior interred by Fu on the Prison Planet. With his astonishing power, he rampages through the Prison Planet and overwhelms Goku and company.
Fu wanted to experiment, so he combined some planets into a prison and brought warriors from across time and space to carry them out. If they want to escape, you need to fight the other prisoners and collect “Special Dragon Balls”.
Goku Xeno came to investigate the disturbance and was trapped. He has the 1-Star Ball. Bodacious has the 2-Star, and the Evil Saiyan in bondage has the 5-Star.
Fu specifically recruited Goku and Vegeta from a Super based timeline by kidnapping Super Trunks while he was visiting his friends in the past. So now Goku, Vegeta and Future Mai are collecting the balls.
SSGSS is stronger than SS4, Bojack is defeated, and while fighting Evil Saiyan, Goku became infected by evil and became Super Saiyan (Berserk, but not like Kale). In order to escape, Coola teamed up with Trunks and became Gold while fighting Goku and Evil Saiyan.
As always thank you for reading.