Artemis, a white guardian cat from the celestial planet Mau, belongs to an advanced feline species entrusted with mentoring the Sailor Guardians. Originally inhabiting the Moon Castle during the Silver Millennium, he served Queen Serenity alongside Luna before their exile to Earth in suspended animation, where they later awakened the reincarnated Sailor Senshi. Tasked with guiding Minako Aino as Sailor Venus’s successor, Artemis equipped her with transformative devices such as the crescent compact and Transformation Pen, while offering tactical and emotional support during her early missions as Sailor V against threats like the Dark Agency and Narcissus. In manga depictions, Artemis adopts a reserved, subtly sarcastic personality, differing from Luna’s warmth. His loyalty to Minako intertwines with a tendency toward critique, creating friction in their partnership. The Dream arc reveals his capacity for vulnerability: temporarily transforming into a humanoid with pale skin, long white hair, green eyes, and a crescent forehead mark, he rescues Minako from peril. This act precedes his guilt-driven decision to gift her the Venus Crystal, catalyzing her evolution into Super Sailor Venus and underscoring their profound mutual reliance. Adaptations diversify his portrayal—the live-action series reimagines him as a plush toy advisor, while the 1990s anime highlights his supportive yet accident-prone nature, including comedic missteps and encouragement of Minako’s idol ambitions. *Sailor Moon Eternal* aligns with manga lore, depicting his strategic transfer of Minako’s Sailor Crystal during a pivotal battle and his humanoid presence alongside Luna and Diana against Queen Nehelenia. Romantic entanglements shape his personal history: a longstanding affection for Luna is briefly disrupted by a mistaken infatuation in *Codename: Sailor V*, though their eventual union in the future produces Diana, Chibiusa’s advisor. While early media obscured his Mau heritage, *Sailor Moon Cosmos* definitively establishes his extraterrestrial roots. His name, inspired by the Greek lunar deity, draws playful critique from Minako in the manga, yet reinforces his symbolic role as a celestial guide. Consistently portrayed as both strategist and emotional pillar, Artemis navigates themes of duty and self-doubt across critical arcs like the Dead Moon Circus conflict. His actions—whether deploying sharp wit or confronting personal failures—cement his integral role in balancing Minako’s growth with the Sailor Guardians’ collective mission.