One idea could be exploring an alternate universe where Ben gets the Omnitrix at a much younger age and has to learn to control it while dealing with school bullies who are after his power. Another could be a story where the Omnitrix malfunctions and starts giving Ben alien forms that are hybrids of different aliens he already has access to.
Gwen is an obvious choice. She can bring her magic skills and her relationship with Ben to the story. Also, Grandpa Max, who has a lot of knowledge and experience that can be useful in the fanfic. Another good character could be Kevin, with his ability to absorb materials and his complex relationship with Ben.
I'm not entirely sure as the term 'reboot novel' is rather broad. It could refer to a novel that has been restarted or rewritten in some way, perhaps with a new take on the story, characters, or setting.
A 'reboot crossover fanfiction' is a really cool concept. Reboot implies a fresh start or a new take on something. When combined with 'crossover' in fanfiction, it usually involves taking characters or concepts from different existing franchises that have been rebooted in some way. Say, if there was a reboot of the Harry Potter series and a reboot of the Lord of the Rings series, a fanfiction writer might create a story where characters like Harry Potter meet Frodo Baggins in a completely new adventure that draws on elements from both reimagined universes.
Another storyline could involve a love interest between Ben (in one of his alien forms) and a female alien. For example, if Ben turns into Heatblast and meets a female alien who has a natural affinity for fire - like she can control different types of flames. They start off as rivals, competing to see who can control fire better, but then gradually develop feelings for each other as they face challenges together and learn more about each other's cultures.
The combination of different alien species and their unique abilities. In fanfiction, female aliens can bring in new powers and characteristics that we haven't seen much in the original series. For example, a female alien with telepathic powers that can communicate with Ben's aliens directly in their minds. It adds a new layer of complexity and interaction.
It might be that the true story aspect of the '90210 reboot' is related to the cultural and social fabric of Beverly Hills. There could have been real - life stories of the young people there dealing with things like new money vs. old money, the impact of social media which is a modern - day real - world factor, and the struggle to maintain a certain image. The reboot then uses these true - life situations to make the story more relatable and engaging for the audience, while still keeping the glamour and drama that the '90210' franchise is known for.
In this fanfic, the relationships among the Omnitrix aliens - as - humans would be full of surprises. The competitive relationships between some aliens might turn into friendly rivalries. Take Diamondhead and Four Arms, for instance. As humans, they might compete in sports rather than in battles. Their relationships with humans who don't know their true identities would also be interesting. They would have to constantly lie to maintain their cover, which could lead to feelings of guilt and isolation. But at the same time, they could form deep and meaningful relationships with those who accept them for who they are, despite their secrets. This would create a web of relationships that are both complicated and fascinating to explore.
Ben himself is obviously very popular. He's the main character and all the stories revolve around him. People like to write about his adventures and how he uses his alien forms to save the day.
One interesting storyline could be Ben getting stuck in an alien form permanently and having to learn to live a normal life like that. He would face challenges like going to school or dealing with his family while being an alien.