Okay so hear me out...
His quirk is really op unless someone has multiple quirks, and it also has a lot of potential.
So what if the MC was reborn as Aizawa and became the Batman in the world of MHA.
What if the MC was reborn as Aizawa along with better intelligence.
I'm not knowledgeable about his early life or how old he is so i cant help you here because im too lazy.
Starts his own company shit like that, makes a suit and learns all martial arts.
Later on he becomes a teacher or continues working as a hero.
Dark Knight Hero: Batman