Aizawa is known to be the CEO of XXX inc. Many years ago, he was introduced to his friend All Might's son Izuku Midoriya. Izuku was appointed as his bodyguard, but Aizawa felt a murderous aura from him. When Aizawa was unable to hold his own in a battle Izuku came by his side and pulled out a gun and didn't say anything besides one word that sent chills down Aizawa's and the other bodyguard's spines. Bang.