Quagmire McDuck was an anthropomorphic duck who is now a ghost, and the 2017 Continuum's counterpart to Quagmire McDuck.
History
Quagmire McDuck is the son of Silas McDuck, brother of Dingus McDuck, uncle of Fergus McDuck and great uncle of Scrooge McDuck. He died at some point prior to 2018, and, like other members of the Clan, came to haunt Castle McDuck as a ghost.
Behind the Scenes
This version of Quagmire McDuck first appeared in the book Solving Mysteries and Rewriting History in the Duck Family Tree.
He later appeared in the series as a portrait and as a ghost in The Secret(s) of Castle McDuck.