The Hatchet is supposed to be a joke
I'll get AznTrueblade on those stat fixes
The song is Hikari no Willpower, from something Dragon Ball Z related. I say something because I am not sure if it is from the Anime or from a game
I believe the Vendor guy is from a Vine meme and, as I stated from before, the Armory guy is from Resident Evil 4
Full Horse is a bit a tough cookie. We may have forgotten to nerf him to make up for the lack of super weapons (Fight Stick, Boop, etc). Next to Batta, Full Horse has had the most problems regarding balance