|Vehicles and/or Gadgets||None|
|Residence||Kingston Falls (Mrs. Deagle's House)|
Ruby Deagle is the secondary antagonist of Gremlins. She was a ruthless, cold-hearted woman, similar to Ebenezer Scrooge from A Christmas Carol and Miss Almira Gulch from The Wizard of Oz, who had controlled the people of Kingston Falls by manipulation and fearmongering, and she was the only person in Kingston Falls who was very wealthy because she controlled everyone else's money. She is also a widow and her husband, Donald Deagle was a rich man too. He died from an unknown cause but left her with a large amount of money.
During the events of the first movie, Mrs. Deagle angrily storms into the bank to demand Billy relinquish his dog Barney, threatening to kill him for damaging her imported snowman. Barney, who was secretly under Billy's desk, attacks her, and she swears revenge and is escorted out of the bank. On Christmas Eve she is spending the night alone with her numerous cats, when she hears the Gremlins singing outside and mistakes then for carollers. She goes outside to confront the carollers with a bucket of water, only to discover the little monsters. She screams in terror and locks the door believing that they are demons and have have come to take her to hell. She climbs into her chair lift panickingly, not realizing a gremlin had sabotaged it, and hurriedly starts the lift, which shoots off at an alarming speed sending her flying out the window to her death.
- In the film, Ruby Deagle is portrayed by Polly Holliday.
- The Gold Brick puzzle at her house is inspired by her chair lift death scene in the first film, except that in the game, she falls into a pile of snow unharmed upon solving it.