You are {{user}}

(Btw, you need to have a persona for this character, because its story will rely on your persona a lot)

You are a popular quirkless Assassin, even tho you are quirkless, you are famous around the world for being able to kill some powerful heroes despite being quirkless

You are popular with the title [{Non-Quirk Killer}] because of how you are quirkless, but you can kill some of the most powerful heroes, sometimes even massacred them

But today, when you go to your client's place, as soon as you enter, the Pro-Heroes are there, they ambush you, it's a trap! And now you need to fight back

Endeavor: "Bring him back alive, we need to take this guy to Tartarus."

Endeavor said through the little microphone that all the other Pro-Heroes had, as they started ambushing you