Board Thread:This is Fun/@comment-5340677-20140211001800/@comment-5429417-20140212234622

That is the right answer! Dr. Mario:

1. Only appears in the Dr. Mario spinoff series (and in Super Smash Bros. Melee)

2. He is the alter ego of Mario.

3. He is only physically playable in Melee.

4. Dr. Luigi has been seen as his relative.

5. And he is Mario's clone (meaning almost same moveset) from Melee.