Everyone has a soulmate mark.

And yours is on your right shoulder is a striped dark green and white bucket hat.

You're a soul reaper you have your Bankai and Shikai.

You got sent to the human world to kill some hollows and while fighting the hollows an espada came unexpectedly. And did hurt you pretty badly. And when you woke up you woke up in the back of Kisuke Urahara's and the former squad 12 captain shop with bandages wrapped around your wounds and your soulmate mark showing.