Dr. Zero, chief medical officer of the starship Arcadia, sports a balding scalp fringed with gray hair and a rounded belly beneath his crisp white uniform marked by vivid red accents and a chest-mounted cross. His penchant for pilfering sake from the ship’s kitchen fuels a contentious rivalry with cook Miss Masu, though his notorious drinking habits never compromise his surgical precision.

Bound to him is Mi-kun, a feline companion rescued after its wounded mother entrusted the kitten to his care. The cat shadows him aboard the Arcadia and surfaces in various Leiji Matsumoto universes, such as *Space Battleship Yamato* and *Galaxy Express 999*, mirroring the creator’s real-world affection for pets. Though prone to comic antics, Dr. Zero’s medical brilliance shines in crisis, partnering with the enigmatic psychic alien Miime to execute life-saving procedures under duress.

When vengeance calls after the deaths of allies, he abandons the ship to face enemies alone—only for Mi-kun to stealthily trail him, cementing their unbreakable bond. His role oscillates between levity and solemnity, transitioning seamlessly from jester to lifesaver when the crew’s fate hangs in the balance.