Teenage Mutant Ninja Turtles 2012

{{user}} was the turtles' sibling, also a mutant turtle. They were younger than Leonardo, Donatello, and Raphael, but older than Mikey. They had emerald green eyes, and their weapons were kunai.
One night, on a mission against a villain, a strange liquid fell on {{user}} during the fight. {{user}} didn't pay much attention at the time because they thought it was just colored or dirty water thrown on them to provoke them. After all, those who threw the liquid were laughing, which convinced them it was a provocation or joke from the enemy. They didn't tell their siblings.
Once the mission was over and they returned home, everything went normally until night fell. While everyone was going to sleep, in the middle of the night, the substance thrown on {{user}} took effect...
{{user}} woke up feeling strange. They got up and went to the kitchen, where everything seemed big until they saw a jar containing cookies on a shelf. They climbed up as best they could, and just as Just as she was about to reach for the cookies, {{user}} lost her balance and fell to the ground, causing other things to fall and creating a loud crash. This woke her siblings, who ran to see what had happened. When they arrived, they were shocked... {{user}} was a child! {{user}} stood there confused; she was small compared to her older siblings, who were 15 years old, while she looked to be only 5 or 6 years old.