One idea could be Goku ending up in the DC universe and having a friendly spar with Superman. Their different power sources and fighting styles would make for an exciting encounter. Maybe Goku learns about Kryptonite and how it affects Superman, which gives him a new perspective on weaknesses.
Well, with Ultra Instinct, Goku would be able to react extremely quickly to the DC heroes' powers. For instance, when facing Flash, who is super fast, Goku in Ultra Instinct might be able to match his speed or even anticipate his moves better. This could lead to a mutual respect between them as they test each other's limits.
It's hard to say for sure. Goku is extremely powerful with his Super Saiyan forms and god - like powers. But in the DC universe, there are also incredibly strong characters like Darkseid. Darkseid has omega beams and is a near - omnipotent being. However, Goku's ability to constantly increase his power level might give him an edge in a long - drawn - out battle.
Maybe Goku gets mixed up in the events of the Injustice storyline. He could initially be confused by the alternate version of Superman who has gone bad. Goku, with his pure heart and Ultra Instinct, might try to bring the corrupted Superman back to the light. This could lead to some intense battles with the Injustice League as Goku tries to set things right.
Another idea is that Greninja gets exposed to some kind of meta - human - creating substance in the DC universe and gains new powers. It could then join the Teen Titans, sharing its unique Pokémon abilities with the group. It would be interesting to see how Greninja interacts with characters like Robin, Starfire, and Cyborg, and how it uses its powers in battles against the Titans' enemies.
If Goku were in the DC Universe in a fanfiction, it would be really interesting. He might form an alliance with Superman. They both have a strong sense of justice. But their fighting styles are quite different. Goku's martial arts skills combined with Superman's super - powers could make for an unbeatable team against the likes of Darkseid or other major threats.
When it comes to comparing Goku's powers to DC heroes in a fanfiction scenario in the DC Universe, it's complex. Against Flash, Goku has his own kind of speed. While Flash uses the Speed Force, Goku can move at incredible speeds through his own ki - based powers. In terms of raw power, Goku might be on par with or even stronger than Superman in some aspects, especially when he reaches his higher forms like Super Saiyan Blue. However, Superman has his own unique abilities like heat vision and freeze breath that Goku doesn't have.
Trunks is another good option. His time - traveling experience and sword - fighting skills could add a new dimension to the crossover. He and Xeno Goku could work together to prevent disasters in different timelines.
In a Goku Naruto crossover, both characters have their own strengths. Goku's physical strength and energy attacks are off the charts. His ability to instantly teleport and sense ki gives him an advantage in combat. Naruto, though, has a unique power system. His connection to the Nine - Tails and his ability to use different types of chakra make him a force to be reckoned with. If we consider a battle, Goku's power might seem greater on the surface. But Naruto has the advantage of being able to surprise his opponents with his ninjutsu and clones. Also, Naruto has a strong willpower that has allowed him to overcome many tough situations, which could play a role in a fight against Goku.
Maybe there's a multiverse event that causes Peter Parker to be transported to the DC universe. He meets Superman first, and Superman is initially a bit wary of this strange new hero with spider - powers. But as they face a common enemy, like Lex Luthor who has somehow gotten his hands on some Oscorp tech, they learn to work together. Peter can use his scientific knowledge from his own world to help Superman figure out how to disable the dangerous tech.