Naruto would probably be the most interested. He loves making new friends and Gohan's power would surely catch his attention. He'd be eager to learn about Gohan's world and his abilities.
One possibility in the 'Gohan Meets Team 7' fanfiction is that there could be a big battle where they all have to team up. Gohan's strength combined with Team 7's unique abilities would make for an interesting dynamic. They could face a new and powerful enemy. Gohan might use his Super Saiyan powers while Team 7 uses their ninja techniques. This could lead to some really cool fight scenes and a deeper understanding between the characters from different universes.
In this fanfiction, Gohan might learn valuable life lessons from Grandpa Gohan. Maybe Grandpa Gohan would teach Gohan some old - fashioned martial arts techniques that have been forgotten over time.
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.
In this kind of fanfiction, Videl and Gohan might meet during a tournament. Videl, seeing Gohan's skills, is immediately drawn to him. She wants to learn from him and they start training together. This could lead to a lot of cute moments, like when Videl tries to copy Gohan's moves but fails comically at first, and Gohan patiently teaches her.
A possible plot twist could be that future Gohan is actually an impostor sent by an enemy to manipulate the real Gohan. Another twist might be that when they meet, their powers combine in an unexpected way that causes some sort of time rift or a change in the timeline.
One possible scenario in a Videl meets Gohan fanfiction could be that they meet in an unexpected place, like a forest during a training session. Gohan might be training alone, and Videl stumbles upon him. She could be initially in awe of his power and determination, which could lead to a deeper conversation about their goals and dreams.
In a fanfiction where Future Gohan meets Goku, it could be an emotional reunion. Gohan might be filled with a sense of relief and joy, seeing his father again. He could show Goku all the things he's been through in the future, and Goku would be both proud and sad about what his son has endured.
I think Captain America would be a likely ally. Captain America is all about justice and doing what's right, which aligns well with Gohan's values. They both have a strong moral compass and would respect each other's fighting abilities.