Best: Negasonic Teenage Warhead
Negasonic Teenage Warhead is also an X-Men mutant, can you guess her power? Her name kind of states the obvious, as her power is the mutant ability to detonate atomic bursts from her body. She can also harness, generate and absorb radioactive energy into herself, which lets her fabricate objects out of thin air like clothes or shelter and levitate people or objects with her mind. She also appeared in the Deadpool films but none of the X-Men movies, yet.