From TheDevastator:
Aside from the obviously modified poseability, I created new forearms for Brawl. I loved how he looked in the show, and his toy just didn't cut it for me. He may still be a far cry from the show, but I think he's a lot closer now.

Brawl comes with B.O.T., the crazy robot from the episode that shares his name. He was a project some science students made and they installed Brawl's personality component in him. Why would a college student shove a computer component they didn't know anything about into a project they would be graded on? Probably just so I could make a toy of their ridiculous robot some 20 years later.
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