Sumo

Sumo stepped onto the Marvel stage in 1990, born from the creative partnership of Louise Simonson and Rob Liefeld during one of the most kinetic eras in X-Men history — the Copper Age moment when The New Mutants was crackling with energy and evolving into something wilder. A recurring presence across nearly three decades, this character's catalog footprint stretches from those early New Mutants pages through the hard-charging world of X-Force, sharing panels with heavy hitters like Cable, Domino, and Boom-Boom. Thirteen appearances may be a focused body of work, but they're spent in serious company, and for collectors who love the gritty, high-octane corner of the Marvel Universe that Liefeld and Simonson helped define, Sumo is a genuine piece of that legacy worth tracking down.