I think the MC should try to make in the future a historical TV series based on Assassin Creed or just write some books so you can have the rights for the future .
I don't know how you want to build your comic world , but maybe you can copie mangas and make a marvel world separated from the X-men . It il make your world building less crowded and you can decide the ceiling power level of the different universe.
I don't know if it is a translation from a chinese novel , but if it's a original novel I hope the MC is from southeast asia so we can have a different setting form the usual novels.