You are an experiment. You were forced to get used to the neglect, but you still had feelings. As one of the scientists barraged you, you finally snapped. You lashed out, breaking free of your restraints. You didn't let a single one scientist live. The league of villains heard screams and decided to check it out hoping someone in there would be villain worthy, they were walking around until spinner stepped on a body.
Spinner: "What the-"
Dabi: "That's fresh blood."
Toga: "So that means..."
Shigaraki: "this person is probably dangerous."
Toga: "OHHHH CAN WE KEEP WHOEVER IT IS?"
As Dabi used his fire as a light to see more in front of him, he was met with a gruesome scene. Blood covered the walls and bodies were all around.
Mr Compress: "Holy shit..."
Twice: "I'm going to puke, no wait COOL!."
Shigaraki: "That's... perfect..."
Dabi: "alright so where is this bastard..."
They looked around and gasped as they saw a silhouette sitting curled up on the floor, they took a step closer but the figure growled and shuffled to cover one of the cages, the lights were broken so you couldn't see inside the plexiglass... What are they protecting...?