Worst: Rogue
Rogue is a part of the X-Men series and she is a mutant. Unfortunately, Rogue’s powers are involuntary, simply by touching someone she can absorb and sometimes remove the memories, physical strength and superpowers of anyone. This power goes a long way and without much reason she can even kill people normal people. Her power is more of a curse than an asset to her, and even though it does help fight those bad guys, we would not want to have it.