So the guy on the right is obviously Little Mac, but do we have anything for tagging someone "dressed" as an m&m?

Of the posts tagged m&m's there currently exists only the single character tag for green_(m&m's) of the m&m's mascots. Given how standardized their design is though, there could broadly be a character tag designed for them and derivative designs.

Of the m&m's mascots, it is yellow who represents peanut m&m's, while blue is the one who represents almond m&m's.