Letter M is usually seen on Mario's hat. M is the most violent member of ABCDEFGHIJKLMNOPQRSTUVWXYZ. M appeared in It's-a Mobile 2: Revenge of the Cupcakes as a major boss in Number Island, Loweegee had to eat it with FANTA (Yuck!) to defeat it. M is still seen in Yahoo Answers and that useless thing learned in kindergarten
After M's death, N came to take it's place.