Jimmy Z is a member of the Wild Kratts crew; he is the main pilot of the Tortuga HQ and operates the Tortuga's teleporter, often teleporting the Creature Power discs, along with various other equipment, to the Kratt brothers.
Jimmy is a young man of average height; he has reddish-orange hair and light blue eyes. He usually wears a blue-green baseball cap worn backwards, a grey t-shirt with a video game character on it, a white, long sleeved shirt worn underneath, red plaid shorts, and white tennis shoes with a slight lean build. He has notable facial hair on his chin (known as a "goatee") and some freckles.
Jimmy's signature color is orange/brown.
Jimmy is easily scared, and he often feels worried and nervous. His blunders are often the start of new adventures for the Wild Kratts. Jimmy is easily confused, and he asks a lot of questions. In some ways, Jimmy is a comic relief character; he likes making jokes, and is very sarcastic. He is not the "creature adventuring" type, and would rather be in the Tortuga catching some Zzzz's, eating some pizza, or play video games. Though he is often shown to be lazy, however, like his teammates, he is quite competent at his job.
Although he is not a "creature adventuring type" guy, and his knowledge in science and technology is limited, without Jimmy, the Wild Kratts crew would not get very far. By teleporting necessary equipment, and acting as an assistant and lab rat, Jimmy helps guarantee that the Kratt brothers' adventures will go smoothly, that Aviva and Koki can build their inventions, that creatures will be rescued, and that the villains will be stopped. He also has exceptional piloting skills, seeing as he is the main pilot of the Tortuga.
- In "Mom of a Croc", Jimmy teleports the Kratt brothers some sandwiches.
- In "Mystery of the Squirmy Wormy", Jimmy attempts to give Aviva a slice of pizza.
- In "Platypus Cafe", everyone, even Jimmy, looks surprised when they find out about the platypus' "sixth sense".
- In "Fireflies", Jimmy's hair turns green as a result of Aviva's failed attempt to replicate the firefly's formula for bioluminescence.
- In "Elephant in the Room", Thornsley, an elephant calf, smashes Jimmy's sandwich and teleports it. Thornsley also drinks from his water jug.
- In "Seasquatch", Jimmy's controller falls into the water.
- In "Masked Bandits", Jimmy plays a video game. He is shown to be placing his controller in a portable vault. Later, his video gaming station gives out an alert, showing that raccoons snatched his controller.
- In "The Gecko Effect", Jimmy screams when he sees a gecko get miniaturized. He later gets trapped in a glass container without his controller.
- In "Termites Versus Tongues", Jimmy walks with a DJ headphone on his head, which plays music that drowns out the minaturized Aviva and Koki's cries for help.
- In "Secrets of the Spider's Web", Jimmy is shot by an invention because the crew has to test it.
- In "Skunked!", Jimmy mistakes a spotted skunk for a kitty cat before he gets sprayed.
- Jimmy is a good cook, and so is his grandmother, Jimmina.
- Jimmy and his controller have a long history together.
- Jimmy has an obsession with pizza.
- His nick name/initials "J-Z" are a play on the famous artist, "Jay Z".
- His full name is unknown, although some fans speculate that his name Jimmy Z actually stands for "James".
- Contrary to what many fans believe, Jimmy has no feelings of attraction to and/or relationship with Koki other than friendship.
- Jimmy's personality is similar to that of "Shaggy Rogers" from the Scooby-Doo franchise.
- Jimmy is allergic to mushrooms.
- "Hold on, monkey dudes. Just how many monkeys are there around here anyway?"
~Jimmy Z asking the Kratt brothers
- "I'll think I'll stick to what ny stomach is specialized to eat... Pizza!"
~Jimmy to Koki and Aviva, Koala Balloon
- "I'm not worried! If anyone can handle the desert, it's the Brothers Kratt!"
~Jimmy to a distraught Aviva, Koala Balloon