Elmyra Duff is the secondary antagonist of Tiny Toon Adventures. Her mentor is Elmer Fudd. She is a sweet and affectionate 12 year old girl with orange hair, long eyelashes and wears a light blue short puffy-sleeved blouse with frilly white cuffs and a collar, a light blue bow with a tiny animal's skull, a white knee-length pleated skirt, frilly light blue and white underwear, a matching training bra, white ankle-length socks and black strapped Mary Jane shoes. Despite her being an unintentional villain, she actually had her episodes where she was the hero. She is obsessed with pets, and can be so loving to them that it hurts them. But there are times where she does demonstrate proper pet care.
- In an episode when she was locked in a mall, she had Arnold the Pit Bull who was a security dog on a leash and had him running when she made him see the dress that she put on him. The leash tied up two cat burglars, and made them fall when Arnold couldn't sustain the weight. The next day, Elmyra was celebrated as a hero for capturing the cat burglars, and the manager of the mall rewarded her by taking anything of her choice. She chose Arnold, and took him home on a stroller.
- She had an episode where she enforced a rule that an animal cannot eat another animal and that she would kick them out if they tried.
- In the episode, Can't Buy Me Love, she refused to give up Furrball to Rhoda Queen after all the abuse she has put her through and said she'd rather lose a friend than give up her Furrball-head.
- She was kidnapped by Arthur Jabba in an episode for ransom of her father's secret formula. While kidnapped, she drove his goons crazy with her TV show to the point where they confessed everything to the police.