Mugman

"Well, we've got a co-pilot here. Mugman, of course. Skye likes to see if Cuphead and Mugman can use a modern helicopter. I think they're off to the Benham Rise today."

--Su Ji-Hoon, Ocean War

Mugman is the deuteragonist of Cuphead. He is Cuphead's brother, and, like the rest of his family, lives on Inkwell Isle. He is played by the second player and can join or leave the game at any time. Due to his deuteragonistic role, Mugman formerly could not be controlled by the first player. However, as of the update in April 2019, the first player can choose to play as him instead.

In When the Cold Breeze Blows Away, he is a pilot of a Boeing AH-64 Apache helicopter during the Battle of Benham Rise.

After defeated Cala Maria in sea battle,he is no longer become AH-64 pilot that he would become the one of Inkwell Isle heroes in during Demonic War.

Same in during USRAC War,he become a WW2 US soldier that he wanted to be national hero like Cuphead but then Cuphead has gone by his assassination,he become one of Inkwell Isle operators in Operation Wallop that still become national hero of Inkwell Isle and being as the one of the Leaders of Operation Wallop

Sheva Alomar and Barry Burton trained and make him become a BSAA member made his responsible for protect Cuphead and all of his friends when the series of WhiteKnight B.O.Ws attacked Inkwell Isle.

Therefore,he is Piers's partner that he will appeared to team up with Survivor Brigade to defeat the apocalypse vanguard of Zeltstrich.