Isekai Omnitrix: Book 1, The Ressurection Of a Hero.
When 19-year-old firefighting prodigy, Ryan, dies in the line of duty, he expects his time on earth to be over. But in a twist of fate, his soul is chosen during the upcoming round of reincarnation selection, and he's given a chance to resurrect in a world where the characters of Ben 10, High school DxD, MHA, Dragon b...