Jackie

Summary
Jackie is Kim's girlfriend. They mutated together after purchasing a black shard from Quinn. Kim mutated first and got an awesome mutation from it, but Jackie's mutation is very inconvenient (but super badass!)

She transformed from a small, waifish girl into a massive hulking behemoth of a creature, resembling a humanoid shark but with a hide that resembles volcanic rock. In addition to being hot enough to start fires with her touch, she can swim through the ground like it was water, leaving a trail of magma in her wake.