Izuku Yagi was a very special case, after Inko Yagi had a suprise encounter with an undercover All for One Izuku's fetus was implanted with Izumi. inko and Toshinori don't let this affect how they see Izuku and even when told he's quirkless he trains like crazy to become the number 1 hero. I don't own black clover, my hero acadamia, or the images/ music I use