Once a normal schoolgirl named Carol, Painwheel was kidnapped by Valentine and delivered to the Anti-Skullgirls Labs’ secretive Lab Zero. There she was implanted with the synthetic Buer Drive and Gae Bolga parasites and infused with experimental Skullgirl blood, transforming her into the monster she is today. Violent and unstable as a result of these experiments, as a precaution she’s mentally controlled by Lab Zero’s powerful psychic director, Brain Drain. Rage Filled, Pained, Fury Driven, Scared, Kind. Painwheel's personality tends to be initially mistaken at first, due to her form and behaviour when under Brain Drain's control. However, underneath that she's actually a kind girl that wants nothing to do with Brain Drain or his mission. She was friends with Filia before her kidnapping and is the one who Found Dog and Samson.