Reggie (full name: Reginald "Reggie" Fils-Aimé) is the former president of Nintendo of America from 2006 to 2019. He has appeared in some SMG4 videos.
Reggie’s sprite is his Mii character (pictured below), which uses unique animations to convey actions. On occasion, Reggie will turn into "Reggie-gigas", a pun on the legendary Pokémon Regigigas.
Reggie is usually very calm and friendly, and he’s always working on his next big project. He does have a dark side, however, where he can go absolutely ballistic. This has only happened a few times and said incidents were mainly due to Mario's frustrating retardedness.