U-Go Girl

Few debuts hit as hard as U-Go Girl's arrival in X-Force #116 in 2001 — the brilliant, boundary-smashing Modern Age reinvention that Peter Milligan and Mike Allred unleashed on an unsuspecting Marvel Universe. She shares her pages with a wild roster including Anarchist, Tike Alicar, Guy Smith, and Orphan, the kind of gloriously strange company that signals immediately you're not in a conventional superhero book. With two key-issue appearances to her name and enough cultural staying power to earn entries in Marvel's Official Handbook volumes for both the Book of the Dead and Teams, U-Go Girl clearly left a mark that collectors and fans have never stopped talking about. If you're drawn to comics that dared to do something genuinely different at the turn of the millennium, she's an essential piece of that story.