What if instead of a quirk Izuku had something else that made him a formidable opponent to anyone that faces him? What if he uses this ability to get anything he wants? What if he uses it to become the world's greatest vigilante?
Izuku's photographic reflexes allowed him to acumulate certain abilities such as being a master assassin and tactician, master martial artist and hand to hand combatant, expert swordsman, marksman and archer, as well as being able to mimic the voice of other's. Not only that but he can use chi under certain circumstances.
Yes he will have a harem and yes Eri will be his daughter. The harem is still being decided so if you have any suggestions comment here.