Non-Pony: When it comes to background characters that don't get enough love, I feel Istara from Samurai Legend Musashi is definitely one of them (That game in general doesn't get enough love). So how about her fighting a couple of Ninjaroids.
Why did she slice that nice man in half? Clearly he was just admiring that wonderful sunset while giving his beloved grandfather's sword a nice polish, when suddenly this crazy chick comes out of freakin NOWHERE and slices him right through his innocent little peace-loving abdomen!
She was honestly my favorite character in that game. ^_^ She was the most down-to-earth and could mainly look out for herself. Unlike all of the other freaking maidens, I didn't really mind carrying Istara around.
We talking about the crazy PS1 awesome Musashi or the PS2 sequel? I have trouble remembering her sadly... My favorite (yet sorta tragic and can't help but feel bad for her) is that crazy Mouse girl that forces you into DDR dance offs xD I loved and hated that part so much ^^ (her ending was sad...)