Agent D first appeared in "It's About Time!". His real name is unknown, although he was referred to as Dana the Duck by Doofenshmirtz in Where's My Perry?.
He is first seen in "It's About Time!" using a chair as a weapon and was later seen in "Cheer Up Candace", along with most of the other agents.
He is a very unpopular agent with his colleagues, clear when the other agents laugh from Doofenshmirtz's inappropriate joke about ducks and then when the agents glare at Agent D after learning that he set up Doofenshmirtz's firing from the agency by filing up many complaints (possibly false ones) to Human Resources.
Mindless animal mode[]
In mindless animal mode, he seems bigger and his eyes are slightly pointing in two directions. His feathers on his head are a bit fuzzy.
According to his secret file, he is flexible to take on many missions due to being semi-aquatic. He is also very good at hand-to-hand combat. (Where's My Perry?)
