The Deagle Gremlin appears in the the first film, Gremlins, and wears Mrs. Ruby Deagle's coat, curly red wig, feathered hat, white gloves and has even applied lipstick to it's mouth and attached an earring to each ear; it has also altered it's voice to try to sound more feminine, presumably just for the fun of it. The fact that the gremlin wears Deagle's clothes and tries to speak like a woman implies that this is the one who who killed Deagle, presumably stealing some of her belongings afterwards. It may have also been the one who had growled, "Deagle, Deagle, Deagle, Deagle!" upon discovering her mansion. It appears to be the only female gremlin in the first film, although it may be a male who acts as a female.
The Deagle Gremlin appears at Dorry's Tavern along with the rest of the gremlins that are wreaking havoc there. The gremlin sits next to Stripe who is playing poker and watches over the rest of the poker playing gremlins. Noticing how one of them has hidden a card behind his ears, whispers to Stripe and then watches how the latter shoots the cheater with a revolver and then laughs while the Deagle Gremlin cackles. The Deagle Gremlin joined Stripe and the other Gremlins at the movie theater, where he presumably met his demise with the rest of the horde.
Greta the Gremlin may be an incarnation of this gremlin