reincarnated in the nasuverse as a ghoul( long hiatus)

what happens when Ryan a normal person is reborn as a ghoul with a system in the nasuverse/fate will he grow and will he wants to conquer or will he be a mob but what we know for sure is that he as a system and don't forget he's a ghoul.(Tokyo ghoul universe) the art is not mine just got it from Google Should I make him go through the multiverse should this be harem or no harem remember I don't own anything in this book except the mc Ryan and this is not made for money but it's made for fun and to test my writing skills