Meso embodies the mascot of the Sexy Commando Club, a diminutive yellow creature with a smooth, rounded silhouette and vibrant blue, mustache-like markings above its eyes. A concealed zipper spans its back, periodically gaping open to unleash entities ranging from extraterrestrial beings to cameos from other fictional realms—such as Meteru from *Galaxy Express 999*, who emerged during the anime’s climactic finale.

Meso’s origins are shrouded in mystery, with conflicting reports claiming it was either salvaged from a derelict spacecraft or discovered at the whimsically named café "Dosukoi Kissa Je T'aime." The creature habitually chirps "Mokyu," yet transforms into a whirlwind of sharp fangs and unsheathed claws when provoked. Though deceptively adorable, Meso’s unpredictable outbursts and the unfathomable contents of its zipper highlight its dual nature as both endearing companion and cryptic enigma.

It shares an especially close bond with club manager Tomoe Kitahara, who devotes considerable time to its care. The zipper’s purpose and the phenomena tied to it remain persistent motifs throughout the series, though their underlying mechanics and wider significance are never explicitly explored. No additional records exist to expand upon Meso’s origins or evolution beyond these documented traits.