I tried to make Guilty Gear sprite-art too. It was rather difficult, but result is fun! =)
I have used these pictures:
http://ggxlol.highervoltage.net/robo-ky/robotauntani.gif
http://ggxlol.highervoltage.net/robo-ky/robo6arms1.gif
http://ggxlol.highervoltage.net/robo-ky/roboairpose1.gif...