Britannia is vaguely based on the whole Captain Britain Corps featured in Excalibur comics. This Britannia was supposed to be a version of Elisabeth Braddock, more popularly known as Psylocke of the X-Men. This one had blonde hair with a blue braid (Betsy originally had blonde or brown hair in the original Captain Britain comics) and wielded a lightsaber-like sword of some kind. I think I was gonna apply for this concept on an Age of Apocalypse game, but I don't remember which one.