Marvel Girl

Bursting onto the Modern Age scene in Joe Casey and Paul Smith's X-Men: Children of the Atom #4 in 2000, Marvel Girl is a fascinating figure in the mutant corner of the Marvel Universe — one whose affiliations alone tell a layered story. She moves through some of comics' most storied and morally complex organizations, counted among the X-Men but also linked to the shadowy Hellfire Club, the ruthless Marauders, and the Sentinels, a combination that hints at a character who exists at the crossroads of heroism and danger. Her appearances across Uncanny X-Men, X-Men: Deadly Genesis, and New Excalibur place her in genuinely significant X-Men territory, and sharing pages with the likes of Wolverine, Nightcrawler, and Iceman puts her squarely in elite mutant company. With three key issues to her name and a presence that's held steady across 25 years and 80 catalog appearances, she's a Modern Age player well worth tracking down.