Bananya is a white cat inhabiting a bright yellow banana peel, with distinct blackish-brown eyes, pink cheeks, and prominent whiskers. His nature is fundamentally optimistic and carefree. He exhibits classic feline curiosity and playfulness, along with occasional hunting instincts towards birds or mice, though these urges are easily tempered by his love for sweets or strong social connections.

He dreams of one day becoming a chocolate-covered banana. Bananya displays empathy, readily showing concern for others experiencing distress, even characters he observes on television. Originally from another planet, as uncovered in "Bananya and the Curious Bunch," his fascination with Earth drives his journey to explore human environments firsthand.

Relationships shape his experiences. He shares a particularly close bond with Droopy-Eared Bananya, whom he met upon her emergence; she eventually follows him to Earth because she misses their companionship. Bananya also harbors an interest in Bananyako, though her attention is directed elsewhere, towards Long-Haired Bananya. Among the trio known as the Bananya Bunch, he acts as the older sibling figure.

Physically agile, he executes impressive high jumps to reach objects like balloons or window locks. Bananya navigates human spaces with stealth, often retreating into his peel to remain unseen. His adventures typically involve simple explorations of household settings, interactions with fellow Bananyas, and occasional mischief—such as investigating refrigerator interiors or encountering stray cats.

Throughout his experiences, both on his home planet and Earth, Bananya remains consistent in his pursuit of joy and meaningful connection. The dream of achieving a chocolate-covered existence serves as a persistent, unifying goal.