That M&Ms commercial introducing "Ms. Brown" didn't sit well with me because I knew there already was a brown M&M... and now I have proof. Just look at this mid-90s advertisement from Nickelodeon Magazine...

Just look at that guy, he looks pretty serious-minded... just a barrel of laughs. I'm guessing he was supposed to be a straight man-type, the Zeppo Marx of candy mascots. But even though they went through the trouble of trademarking him and everything, the spotlight he seeked never came... what a pity.