One great 'Dbz Crossover Future Gohan Fanfiction' is 'Gohan's New Adventure'. It combines the world of DBZ with a unique fantasy realm. In this fanfic, Future Gohan has to use his skills in a completely different environment filled with new enemies and allies. It's really exciting to see how he adapts.
A good 'Dbz Crossover Future Gohan Fanfiction' should stay true to Gohan's character. He is a complex character with a lot of depth, so the fanfic should not make him act out of character. For example, his determination and love for his family should be intact.
Definitely Superman. Superman's super strength and Gohan's Saiyan power would make for an interesting combination. They could have a friendly sparring match to test their limits. Another good character could be Ichigo from Bleach. Ichigo's sword - fighting skills combined with Gohan's martial arts and ki blasts would create some epic battle scenes.
For a 'dbz gohan crossover fanfiction', a plot where Gohan crosses into the DC Comics universe would be exciting. He could team up with Superman and learn about different types of powers. Maybe he'd help Superman understand the concept of ki. Another idea is a crossover with the Final Fantasy series. Gohan could find himself in a world full of summons and magic, and use his martial arts to fight alongside the Final Fantasy characters.
To write good character interactions for Future Gohan in a crossover, first understand his character. He's a strong fighter but also has a gentle side. If he's crossing over with, say, Spider - Man, Gohan could be initially confused by Spider - Man's web - slinging and quippy nature. But then they could bond over their shared sense of responsibility to protect their worlds.
One idea could be a crossover with the Dragon Ball Super universe. Future Gohan could meet the present - day Goku and Vegeta. They could train together and learn new techniques from each other. Another plot could involve a crossover with the Naruto universe. Gohan might use his ki powers in the ninja world, and perhaps have to face off against powerful ninja like Naruto or Sasuke. He could also learn some ninja skills in return.
In this 'dbz gohan snaps fanfiction', it may depict Gohan's transformation from his normal self to a more extreme state. This could be due to a variety of factors. It could be related to the constant battles and the toll it takes on his mental state. Or perhaps he discovers some dark secret that makes him snap. The fanfiction would likely detail his internal struggle, his newfound abilities if any, and how it impacts the overall Dragon Ball Z universe. His friends and foes would surely be affected by this change in Gohan, and the story could explore all these aspects in great detail.
Goku is often a common character. Since Gohan has a strong relationship with his father, in time - travel scenarios, they might interact a lot. For example, Gohan could go back in time to save Goku from an early death or to train with him. Vegeta is also a likely character. He might be skeptical of Gohan's time - traveling at first but then get involved in Gohan's plans. Another common character would be Piccolo. He has been Gohan's mentor, and in time - travel stories, he could offer his wisdom and help to Gohan again.
In such a fanfiction, perhaps future Gohan could warn present - day Gohan about upcoming threats that he has faced in his own timeline. He might share his experiences and knowledge, which could make present Gohan a stronger fighter and a wiser person.
Obviously, Gohan would be one of the main characters since it's about him snapping. And likely, his family members like Goku and Chi - Chi could be important as they might be related to the events that lead to his snapping or be affected by it.