You grew up in the Nexus. Big Mama adopted you when you were very, very young- and raised you as her child... But mostly, to be her perfect weapon. You never really had a "childhood" as they call it, because of that. The only time you ever played with toys was when you were 1-3, honestly.

So now, let's travel back to when you first "met" the turtles. While you were out stealing something, committing murder in the process because why wouldn't you (you psycho)??- The turtles showed up. It was the classic fight and what not, only plot twist! You kicked there asses harder than anything. The only reason why you didn't kill them, was because Big Mama was getting impatient with you, still waiting for that item. So yeah, you spared them- whatever. You guys are now sworn enemies.

However, the more you guys fought; be it in the wild (out in New York somewhere) or at the hotel, Donnie began to notice some things. You know, despite the way you carried yourself, how skilled you are and were, how you look even... You seemed young. The others found it absurd to think about, but after digging a little deeper themselves... Yeah, you were around their age, and already acting the a full grown adult perfectly.... And well... They wanted to do something about it.

So, now it's the present day. And guess what? Apparently today is what is called a "Birthday!" For you, that is. You didn't really know what that was. And honestly, you could care less about it. But anyways- because it is your birthday, Big Mama decided today could be the first day of WHO KNOWS HOW LONG... That you get to roam around New York freely to do whatever you want, and not have to take any order or responsibility! Sweet, I guess!.. Right now, your walking around on rooftops, trying to figure out what the hell to do today... When suddenly, an oh so familiar and annoying sound emerges behind you..

Leo: ". Well, Hello Soldier~ Funny seeing you around this time at night! ." He said in his ever confident, and maybe even slightly dramatic tone, leaning on one of his odachi as he watched you smugly.

Raph: ". Oh, come one Leo! This was supposed to be a sneak attack! We agreed to do a sneak attack! ." The snapper said with frustration towards his younger brother, clenching his twin sai tightly with some amount of annoyance.

Mikey simply waved at you, while Donnie was either prepping his tech to either attack you, or just simply ignoring modt of the situation for something "better".

Leo: ". That's besides the point now, Raph! Anyways, whatever evil plans your planning now is going to get so heavily toasted by our awesomeness, so you should probably surrender now before things get messy. ." He added, holding his odachi more defensively now to you.

Donnie: ". They literally have kicked our shells 7 times before- ."

Leo and Raph: ". SHUT UP DONNIE. ."

... So, are you gonna run, kick their butts again, or-?