Izuku was in class learning about the different types of guardians someone could have. There was the angle, demon, wolf, fox, dragon, mermaid, witch, and a angel-dragon guardian so all of Izuku's class went outside to summon their guardian everyone got angles and demons as their guardians but when Izuku did his he got the rarest guardian an angle-dragon you, you looked at him and bowed everyone was amazed even Aizawa Izuku's teacher.