King Windbag's Servant
From the Super Mario Wiki
In The Adventures of Super Mario Bros. 3 episode "Life's Ruff", Luigi had traveled to King Windbag's castle under the request of Princess Toadstool, to serve as a counselor to the King. When Luigi arrived, he could witness King Windbag bullying his servant around, ordering him to serve him duck when he had been presented with turkey.
Afraid that his floors were too dirty for Luigi's company, King Windbag ordered his servant to mop the floor, even though it wasn't dirty in the first place. Afraid of the wrath of King Windbag, the servant rushed to work, while King Windbag insulted him in front of Luigi. After Luigi referred to King Windbag as a bully, King Windbag dismissed his comment, and used his wand to scare his servant into bringing him his duck.
As the servant walked off, he overheard King Windbag commenting that a dog would make a better servant. The servant then commented to himself that he might as well be a dog with the way King Windbag treated him. Hip and Hop Koopa, who had followed Luigi to the castle, heard the servant, and got an idea; Turning King Windbag and Luigi into dogs.
Hip and Hop tripped the servant, and used his hat and covered plate as disguises to sneak up to King Windbag. The twins succeeded in stealing King Windbag's wand, using it to transform him and Luigi into dogs.
After a lengthy adventure to get the wand back, King Windbag returned home a kinder king, and demonstated his newfound kindness by treating his servant to a meal, much to the servant's surprise. He is voiced by John Stocker