Captain Radio-Hat was a Captain in the army of War Stompers who briefly besieged Mechanicsburg on behalf of the Knights of Jove. Given his ethnicity, probably a mercenary. We don't know his real name, but given his headgear, how could we possibly call him anything else?
A British upper-class twit of the first water (notice the buck-teeth, the haw-hawing, the use of the phrases "b'god" and "wot"), Captain Radio-Hat displayed a love of shooting Jägers, an unfortunate lack of caution when dealing with supposedly unarmed Sparks, and an inability to . To be fair, he didn't get much of a chance to display any other character traits.
Still, he will be missed, even if only slightly, for his dashing taste in haberdashery, eh wot?