Zundar is a hedgehog-like alien from an unknown distant planet, sporting a green body and a distinctive arrow-like shape on his head. His speech is marked by a moving snout while his mouth stays still, ending every sentence with "dar." As commander of the Conquest Club, he initially acts as the primary antagonist, driven to conquer Earth by a profound disdain for love, which he dismisses as a "stupid emotion."

He is the older brother of Dadacha and operates under the authority of Lord Hireashi, a hierarchical relationship fully revealed later when Zundar is exposed as a subordinate rather than an independent commander. Zundar wields "Zundar needles" as weapons, initially claiming they are precious resources to be conserved. However, he later expends a significant quantity to rescue Hireashi, demonstrating their expendability when prioritizing loyalty over his earlier stated limitations.

Throughout the series, Zundar manipulates Binan High student council members Kinshiro Kusatsu, Ibushi Arima, and Akoya Gero, transforming them into the antagonistic Caerula Adamas (Golden, Silver, and Pearl Chevaliers). They spread negativity, creating monsters embodying human vices like anger and jealousy. His role evolves across media: in the OVA *LOVE! LOVE! LOVE!*, he and Dadacha create a "Second Button Monster" to disrupt a graduation ceremony, ultimately defeated by the Earth Defense Club without their transformation sequences.

Zundar's influence continues in later developments, including the 2025 series *Binan Kōkō Chikyū Bōei-bu Haikara!*, as part of ongoing conflicts involving new characters. His name potentially references "zunda mochi," a green bean-based Japanese confection.