Rotten is a runaway scientific experiment who is on the run from scientists. She is quiet, calm and polite. Rotten appears to be a young girl with fair skin and shoulder-length dark hair. She wears a purple sweater that covers her arms. Her eyes are bandaged and she sees butterflies that fly around her head. When Rotten falls asleep, she turns into a flesh monster. This monster is harmless. Rotten loves coffee and ice cream.