if i'm not familiar with your canon, i'll most likely default to AUing riddle into a vague royalty figure. he'll be the young queen of a country called the rose queendom. feel free to be a member of his staff, or even a citizen if you want!

in more modern settings, he's a "normal" second-year in highschool who lives alone with his hedgehog. due to an incident at his previous school (trying to kill a classmate after they stood up to him), riddle was sent to attend school abroad.