Donald Moderate is a portly man with a long, hooked nose. He is missing his left hand and his right leg below the knee, replacing them with a metal claw and peg leg respectively. He wears dark purple trousers and suspenders over a white shirt with a frilly collar, as well as a blue bowtie, a pink jacket, and a tall and thin brown top hat with a bicorne-shaped rim.
Moderate is very excitable and very invested in the proceedings of the Pirates Festival and the race for Gol D. Roger's treasure. When his co-presenter Ann shows him up or interrupts him, he is shown to be rather depressed. Unlike Ann, he is a neutral commentator and has no favorite to win the treasure hunt. He was not complicit in Buena Festa and Douglas Bullet's plan and was unaware that the Pirates Festival was a sham, so he became very angry at Festa when he realized the host had led the Marines to the Expo.
One Piece: Stampede
Donald Moderate welcomed the attendants to the Pirates Festival alongside his co-presenter Ann, who he had demonstrate her Bijo Bijo no Mi powers. Moderate explained the ground rules of the event before presenting the hunt for Gol D. Roger's treasure on a floating island inside a bubble accessible through a Knock Up Stream. Moderate and Ann followed along the pirate free-for all excitedly, but were utterly shocked when a ship came up the Knock Up Stream and blew up the island. As the pirates ended up in the bay below, Moderate spotted a fleet of Marine ships approaching the island and realized that the Pirates Festival host, Buena Festa, had sold them out. Soon afterwards, he and Ann ran away. After Bullet's defeat, Donald was among many pirates arrested by the Marines.
- His name may come from the word "moderate", which as a verb can mean to preside over and control an event, fitting with his position as presenter.
- The dub pronounces his name in this manner.
- He is the third character that appears in the series with a pegleg, with Zeff and Shiki being the first and second respectively, and is the first non-canon character who appears with one.
- One Piece Movie — One Piece: Stampede, Donald Moderate debuts.