Colonel Mugren is a large man with broad shoulders, a stocky abdomen, and thin legs. He has a large, round chin and a downward pointed nose. He wears a light-colored shirt that buttons in the front and has a frilled collar. He also wears dark-colored pants and dark-colored, pointed boots.
In his concept art, he was seen smoking a cigar.
After the Roger Pirates disbanded, it is unknown what became of Mugren.
- One Piece Manga and Anime — Vol. 96 Chapter 966 (p. 15) and Episode 966, Colonel Mugren makes his debut.
- SBS One Piece Manga — Vol. 96, Colonel Mugren is named by Oda.
- One Piece Manga — Vol. 96 Chapter 967 (p. 19), Mugren and his crew make the final voyage to Laugh Tale.
- One Piece Manga — Vol. 96 Chapter 968, The Roger Pirates disband.