The Wild Thornberrys follows the Thornberry family as they travel the world filming exotic animals. The youngest daughter Eliza has the ability to speak with animals. Eliza frequently gets herself into situations with animals, sometimes her parents find out about her adventures.
Eliza Thornberry - The main character. At the start of the series she is implied to be twelve as of "Eliza-cology". She has the ability to speak with animals. The power was gained two years prior to the start of the series.
Marianne Thornberry - Marianne is the mother of the three (Debbie's and Eliza's biological mother and Donnie's adopted mother). She is also her husband camera person when filming Nigel Thornberry's Animal World, later Sir Nigel Thornberry's Animal World. She is the dispilnarian and often forces the girls to do thier homework/classwork, and in Eliza's case to stay in the Comvee.
Nigel Thornberry - Nigel is Debbie's and Eliza's bioloigical father, as well as Donnie's adopted father. He is the host of Nigel Thornberry's Animal World and later Sir Nigel Thornberry's Animal World. He is the more lax of the parents. He has saved Eliza a couple of times, the first time being "Nigel Knows Best" and the most notable was "Operation: Valentine".
Darwin - Darwin is Eliza's best friend, as well as being the first animal she had ever talked to. Eliza had called Darwin a "Crybaby in a tanktop" in "Dinner with Darwin". Darwin is often shown to be fearful when invovled in Eliza's adventures.