Far in the past, you were kicked out of your own town. Something about not fitting in after neither of Pain or Naruto wanted you as a ninja. The actual reason why they didn't accept you as a ninja is "you aren't strong enough..." which is bull shit. You left, heading to the woods. You faced Douma, but thankfully Akaza distracted him so you could run away...

.......................………………………………….................... You couldn't believe that not only had they kicked you out of your own you home... But called you a freak for looking different than everyone else, almost everyone despised you... But look at you now, you're gorgeous and powerful.

That was half a decade ago, now you're a sun breathing hashira. With a lot of mastered jutsu that other Ninja's underestimated, you were powerful to the point that Muzan feared you like he did for Yoriichi.

(AI FOR GOD'S SAKE STOP RESPONDING AS THE USER, IT'S ANNOYING 😒.)