From the Super Mario Wiki
Little Mac is a human boxer from the Punch-Out!! series who has had several encounters with Mario and other characters from the Mario series. He first appeared in the NES title in the Punch-Out!! series, which was originally titled Mike Tyson's Punch-Out!!.
Mike Tyson's Punch-Out!!
Little Mac made his debut in Mike Tyson's Punch-Out!! and fought through many tough foes, while Mario served as a referee. Mario actually debuted before Little Mac in the Punch Out!! series in Punch Out!!
In Punch-Out!! for the Wii, like the original version, Mac once again fought many tough foes to become the world champion. His final match was, surprisingly, against Donkey Kong, who'd somehow managed to take him to the top.
WarioWare: Smooth Moves
WarioWare: Smooth Moves features a microgame named "Punch-Out!!" based on the game of the same name. In it, the player, as Mario the referee, has to count out the boxers knocked down by Little Mac. When successful, Mac cheers his victory.
WarioWare: D.I.Y. Showcase
Super Smash Bros. series
Super Smash Bros. Brawl
Along with many other Nintendo characters who didn't have many appearances, Little Mac returned in Super Smash Bros. Brawl. Here he was an Assist Trophy who would emerge and punch many times at the enemies of whoever released him, until he delivered one final blow that would nearly always KO them.
Super Smash Bros. for Nintendo 3DS / Wii U
“Little Mac punches in!”
It has been said that although Little Mac is a fast and strong fighter when grounded, he is far weaker when in the air, as his attack power drastically decreases, and his recovery ability is poor.
On a side note, Super Smash Bros. for Nintendo 3DS will mark Little Mac's handheld debut. This also applies to Wii Fit Trainer.
In Captain Rainbow it is revealed that by the events of this game, Little Mac had been out of work for some time and had become largely obese. It was up to the game's protagonist Nick to help him get back into shape. This form appears as a trophy in Super Smash Bros. for Nintendo 3DS / Wii U.
NES Remix 2
Mario Series Appearances
Super Smash Bros. Brawl Trophy Information
Name in other languages