As a subculture. I know it's a pretty cult following show, but from the kind of excitement I've seen over the last few weeks about it either spawning a new show on Cartoon Network (same people, different show sadly).
As well as this, hints at Valve and CN/people behind MXLR co-oberating on a game based on it. I was thinking we could either do this as a Megas XLR or Giant Robots subgenre. Honestly, I'd rather do a giant robots subculture, that way could put The Big O, Gundam, Zoids, etc. as different branches. I think Big O and Gundam, probably have a far higher following than MXLR and it would only make sense to do so.