Gallette is a male cat character with visible animal ears, blonde or yellow neck-length hair, and an adult appearance. His distinctive design features facial hair, a hat, and sunglasses. He debuts in episode 3, "Long, Long Ago," becoming an ally to protagonist Taruto. Episode 7, "Secrets, Secrets," further develops his personality and role. Gallette consistently applies practical and quick-thinking approaches to situations. His cleverness makes him an effective mystery solver and clue decipherer, establishing him as a reliable problem-solver within the group. He functions as the companion animal to human character Geppei Okaki, maintaining a close association. Gallette regularly accompanies Geppei during their adventures, placing him at the center of key interactions and plot developments. His preferences include protecting Taruto and avoiding confrontations with antagonists. He displays a distinct aversion to dangerous situations, trouble, and harm. Separation from his owner or allies is also a significant dislike.