Repugnus

Repugnus is a Decepticon-aligned Autobot double agent — a Monsterbot who transforms into a monstrous insectoid creature. Deliberately repulsive in personality and appearance, he operates as an infiltrator, using his unsavory nature as cover for dangerous undercover work among Decepticon ranks.

Few Transformers carry a name quite as memorably unpleasant as Repugnus, who crashed onto the scene in Bob Budiansky and Frank Springer's The Transformers: Headmasters #1 in 1987, right at the dawn of comics' Copper Age. A Marvel creation through and through, he's carved out his niche across a surprisingly enduring stretch of nearly four decades, sharing pages with the likes of Hardhead, Crosshairs, Blurr, and Slugslinger. His catalog appearances may be select, but for collectors who love the wilder corners of the Transformers universe, a character with a debut this iconic and a name this unforgettable is absolutely worth tracking down.