What are some interesting plot ideas for a 'Ben 10 x Rook' fanfic?

By having them face a common enemy. When they fight side by side against a powerful foe, they can learn to trust each other more and understand each other's fighting styles better.

Friendship is a common theme. It could show how their friendship develops over different adventures in the Ben 10 universe.

One idea could be exploring Alien X's internal conflict between Bellicus and Serena in a new situation. For example, when faced with a moral dilemma on a planet where two species are at war and both have valid reasons for their actions. Another plot could be Alien X having to deal with a powerful new enemy that can somehow disrupt his omnipotent powers. Maybe this enemy has the ability to split Bellicus and Serena's consciousness further, causing chaos within Alien X.

An interesting aspect could be exploring Rook's past more deeply. Maybe he has some secrets from his time before being a Plumber that are related to the Ben 10 Omniverse. Ben could help him uncover these secrets while they are on a mission. For example, they could be investigating an ancient alien artifact, and as they dig deeper, Rook's past starts to unfold.

A really interesting plot could involve a time - traveling aspect. Ben and Julie accidentally travel back in time to when Ben first got the Omnitrix. They have to be careful not to disrupt the timeline while also trying to find a way back to their own time. Along the way, they could meet younger versions of characters they know and have some really fun and emotional interactions. This could also lead to Ben learning some important lessons about his powers from his past self.

One possible plot could be that Rook and Ben go on an adventure to a new planet in the Ben 10 Omniverse. They encounter a strange alien species that has a unique power. Ben tries to use his Omnitrix to transform into an appropriate alien to deal with the situation, but there are some glitches. Rook, with his Plumber skills, helps Ben figure out what's wrong and together they overcome the challenges and make new friends among the aliens.

Another way is to follow some fanfic writers who are known for writing about these characters. They may post new 'ben x rook fanfic' on their personal blogs or on writing platforms. You can discover them through social media or by searching for Ben 10 fanfic writers.

One idea could be a story where Ben and Kevin have to team up against a new, powerful alien threat that neither of them can face alone. They have to combine their powers and skills in unique ways.

Perhaps Ben, while exploring a new planet in his travels, stumbles upon a world that has a very Avatar - like culture and power system. He has to learn to use their ways in combination with his alien forms to survive. For example, using Heatblast's heat powers in a more refined way similar to firebending.

Another interesting plot could be that some of Ben's alien forms are mistaken for new mutants in the Marvel Universe. He then has to prove that he's not a threat while also helping the X - Men deal with a common enemy that is interested in the genetic makeup of both mutants and Ben's alien forms.