Ian M. Costello

Stepping onto the page in 1988 courtesy of Larry Hama and Ron Wagner, Ian M. Costello is a Copper Age figure embedded in one of Marvel's most beloved military action franchises — G.I. Joe, A Real American Hero. With a catalog presence stretching all the way to 2025, this character has quietly endured across nearly four decades of the series' remarkable longevity. Costello keeps gritty, colorful company — sharing pages with the likes of Blocker, Mutt, Zarana, and Avalanche — the kind of ensemble that defines the rich, sprawling world Hama built issue after issue. A modest appearance count makes every showing count, and for dedicated completists, tracking down those issues is part of the joy.