Daffy is the youngest of the New Batch of Gremlins and one of the titular major antagonists (along with George and Lenny) in the 1990 film Gremlins 2: The New Batch. He is crazy and a completely nutty gremlin, even more so than any other member of his species, he is easily recognized thanks to his his large, round eyes, which whirl constantly in a chaotic manner. He is hyperactive and has a mad sense of humour, and is constantly laughing hysterically.
As a mogwai, his fur was quite patchy; being mostly orange and brown with a white belly and beard, he also had a loopy tuft of fur atop his head. His most recognizable features are his massive orange eyes, which constantly swirl and spin around.
His gremlin self is a lighter shade of green than most gremlins, and retained a few thick yellow strands of "hair" that hang limply in the manner of the original incarnation of Daffy Duck from his Mogwai self.
As a Mogwai
He first appears when Gizmo got wet and is seen bouncing around until he hits a wall and uncurls, immediately beginning his crazy antics by throwing paint everywhere. He is taken back to Billy Peltzer and Kate Beringer's apartment, when Kate mistakes him for Gizmo (Daffy was the only one of the new batch who had color scheme similar to Gizmo, as the new batch were black and white as opposed to brown and white), Daffy causes a mess in the apartment, where Kate feeds him before midnight (remembering the most important rule), where Daffy was served mashed potatoes, a chicken leg, and corn. He liked to play with his food more than eating it, throwing most of the food on his plate at Kate. He is taken back to the Clamp Center by Billy while he tries to find the others before they feed, but he attacks a security guard and escapes (apparently eating the blood of the security guard after midnight or found some food later on).
As a Gremlin
He later reappears in a cooking show, now a Gremlin, and sits in a boiling pot of noodles while George and Lenny blow up a microwave, setting off a sprinkler system and spawning more Gremlins. He appears briefly dressed as a repairman messing about with the controls for an elevator which actually saved Kate from a bunch of Gremlins in the elevator.
After not showing up for a while Daffy knocks out Billy who is in search for Gizmo, straps him to a chair and attempts to drill and pull his teeth out using dentistry equipment. Murray Futterman comes to Billy's rescue by fending off Daffy with a dentist light.
Daffy appears for one last time in the lobby with most of the other Gremlins, seen wearing Groucho glasses (fake nose and sunglasses) on the right hand side of the Brain Gremlin.
Daffy is killed by the Electric Gremlin along with the others, although his death is only seen in a deleted scene where he dies laughing as the complete wacko he is.
Daffy was a Mogwai.
His name and a part of his crazy behavior is a reference to the famous Looney Tunes character Daffy Duck. The Daffy Duck character also made an appearance in the movie as well.
When Daffy was mistaken for Gizmo by Kate, she called him Gizmo. During the Peltzer kitchen scene, when Daffy was still a mogwai, he said "I'm not Gizmo!" twice mockingly.
He is the only Mogwai who can control himself bouncing around when immediately born. He did not take Gizmo in the prison like the others. Even so, Daffy is the only Mogwai who was immediately laughing when he was spawned off of Gizmo.
Unlike the other members of the new batch, Daffy doesn't seem to hate Gizmo.
Daffy is probably the most friendly of all the gremlins and mogwai aside from Gizmo.