During the course of the franchise's last two movies and the previous episodes in Dragon Ball Super, it has become undeniable that the franchise's protagonist, Son Goku, has already become a tad too strong. Indeed, his current strength right now probably matches that of God of Destruction Beerus to a certain degree, which means that for Goku, there are very few enemies that would actually pose a challenge.

This has been addressed by numerous fans during Son Goku's brief fight with Black Goku. During that match, Son Goku clearly outmatched his opponent, with the Z fighter severely hurting his evil incarnation while he was just in his Super Saiyan 2 form. With Goku being practically overpowered, fans are clamoring for other characters to finally have their moment, especially when it comes to the upcoming defining battle against Black Goku.

Instead of Son Goku once more playing Deus Ex Machina with his Super Saiyan Blue form, fans are suggesting that these three characters would make for a far more compelling final opponent for Black Goku.

Vegeta

Vegeta is easily the second-most powerful fighter next to Goku. Unfortunately, he has been ushered to the sidelines for the most part of Dragon Ball Super. This is quite a shame, since he is actually the one with a pretty valid reason to fight Black Goku. After all, among the most nefarious acts of Black Goku was when he killed Vegeta's wife, Bulma, in cold blood. Goku mainly wants to fight Black Goku because he is intrigued by the villain's power. Vegeta, on the other hand, actually has a far more valid reason.

Gohan

Fans of Dragon Ball have been pretty vocal about their disapproval of Gohan's character progression. During his prime in Dragon Ball Z, Gohan was being built up as a man who would succeed Goku in the future. However, he was sadly, and badly nerfed, with the Gohan in Super turning into a full-on pacifist. However, just like Vegeta, Gohan also has a pretty good reason to fight Black Goku, since his family is fated to die in the future, most probably under the hands of the villain.

Future Trunks

Future Trunks has always been a fan favorite in Dragon Ball. Since reappearing in Super, the young Saiyan has been developed as a man who has been ravaged by grief over Black Goku's rampage in the future. It is quite certain that Future Trunks would get far stronger in the current arc. Thus, it would definitely be interesting if he ends up fighting Black Goku in the final battle as well. After all, he is the one who actually experienced Black Goku's merciless deeds firsthand.