Esmeralda is a large, shiny golden tiger with several stripes going down her body and tail and has dark, evil eyes.
Esmeralda is shown to be all soft and cuddly when Katrina tickled her. But most of the time, Esmeralda is seen tough. After she was defeated by Grojband singing My Mind, she turned into an adorable golden kitty.
- In the episode "The Pirate Lounge for Me," Kon had a thought about a golden kitty. This golden kitty looked exactly like Esmeralda.