6Arkanos6
after Ben 10 he should get nzt think it is called he should go to that world to learn technology cause most worlds have no technology or are to advanced if he when to dc or marvel there is so much tech that can kill him an then in worlds like game of thrones there's no technology but I think the world he should go to advance his assassin's skills would be assassin's creed an the ability in that world is really useful