1. Mario:mario:
2. Waluigi:waluigi:
3. Wario:wario:
4. Luigi:luigi:
5. Bowser:bowser:
It was not, in fact, intentional for me to play completely Mario characters.
I didn't follow any guides at all. I opened Project M Wario's FitWarioMotionEtc.pac and extracted the animations I desired. Then, I opened the vBrawl (or Brawl Minus) FitWarioMotionEtc.pac and replaced the animations.