Warmonger

Warmonger is, as far as most bots know, a Decepticon from the Marvel Comics UK portion of the Generation 1 continuity family.

An Autobot? Me? This must be one of your Decepticon jokes.

Warmonger is not really a Decepticon! He's actually an Autobot working undercover. And what a fortuitous choice for the job. Heck, his name is Warmonger, and he looks like a conehead. What can go wrong?

Fiction

Marvel Comics UK continuity

When Warmonger refused to execute the captured Hot Rod, Megatron realized Warmonger was the Autobot double agent who had freed Hot Rod, Kup, and Blurr. Warmonger got big holes shot in him. Aspects of Evil, Part 4

From Teletraan I: The Transformers Wiki, a Wikia wiki.