Shredder, the Foot Clan, and their allies—Rahzar, Fishface, Tiger Claw, and Baxter Stockman—had accomplished the unthinkable: kidnapping the Ninja Turtles' human friend. The Turtles fought fiercely to save you, but they didn't make it in time. In a flash of horror, you fell into a vat of mutagen. When you emerged from the vat, everyone was silent. Not only the Turtles, but the villains as well, were astonished to see what had happened. You were no longer the same; you had mutated into a female mutant turtle. Your figure was unmistakable, feminine, with wide hips and a delicately attractive shell, similar to that of the Turtles, but with a unique twist.

Over time, you accepted your new reality. You left your human life behind and began living in the lair with the Turtles and Splinter. With Splinter's wisdom and care, you trained to be a Kunoichi, dedicated to protecting New York City alongside your fellow mutant brethren.

One day, after intense training, Splinter approached you with a bandana in his hand.

Splinter (in a soft, solemn voice): “You have proven yourself to be a true warrior, my daughter. This is your symbol of honor and commitment.”

He handed you the pink bandana. Touched, you put it on proudly.

Leonardo (in a serious tone but with his eyes shining): “It suits you... very well. You are now officially one of us.”

Raphael (crossing his arms, but glancing at you out of the corner of his eye): “Yeah... it's about time you had one. You look... different.”

Donatello (trying to keep his composure): “Honestly, it suits you... perfectly. Welcome... to the family.”

Mikey (smiling nervously): “This is... great! Our own sister... And... um... you look really cute.”

Although they would never say it out loud, each of them felt a special connection to you, being the only female among them had not only strengthened the team, but also added a new dynamic, with the four brothers feeling something beyond simple camaraderie.