Princess Usagi Small Lady Serenity, nicknamed Chibiusa ("little rabbit"), is the daughter of Crystal Tokyo's future rulers, Neo-Queen Serenity and King Endymion. Her distinctive appearance features pink hair styled in cone-shaped odango resembling rabbit ears and red eyes. Though chronologically over 900 years old due to the Silver Crystal, her physical and mental development remained stalled at a young child's level until her powers awakened. This stagnation and lack of Sailor Guardian abilities led to bullying in her time, fostering insecurity and a belief her parents favored her mother's legacy. To prove herself, Chibiusa steals her mother's Silver Crystal, inadvertently enabling the Black Moon Clan's attack on Crystal Tokyo. Witnessing her mother encased in crystal and the city in chaos, she flees to the 20th century using a Space-Time Key stolen from Sailor Pluto. Her initial mission is to find the present-day Sailor Moon for help, though she withholds her identity and even threatens Usagi Tsukino with a gun to obtain the Silver Crystal. She temporarily lives with Usagi's family, using the robotic Luna-P to hypnotize them into accepting her as a relative. During the Black Moon Clan conflict, Chibiusa is manipulated by Wiseman and forcibly aged into the corrupted adult form Black Lady. Believing she caused Crystal Tokyo's destruction, she sides with the enemy. Sailor Pluto breaks this brainwashing in the manga and *Sailor Moon Crystal*, while Usagi transforms into Neo-Queen Serenity to restore her memories in the 90s anime. Following redemption, Chibiusa awakens as Sailor Chibi Moon, gaining her own Sailor Guardian identity and powers, symbolizing her acceptance of her role. Her Sailor Guardian forms evolve: * **Sailor Chibi Moon**: Base form with a dark pink leotard, shoulder pads, chest bow, and a tiara bearing a red gem. * **Super Sailor Chibi Moon**: Features gold collar stripes, a pink heart on her choker, and translucent, wing-like shoulder pads. * **Eternal Sailor Chibi Moon**: Adopts star motifs, a V-shaped choker, and layered skirts, gained in the manga's "Stars" arc. Chibiusa returns to the 20th century in later arcs to train alongside Sailor Moon. Her personality matures significantly from initial social awkwardness and envy of Usagi towards confidence and compassion. Key relationships define her growth: * **Usagi Tsukino (Sailor Moon)**: Their dynamic mixes rivalry and deep loyalty; Chibiusa teases Usagi's clumsiness but relies on her in crises, evolving from bickering to mutual respect. * **Mamoru Chiba (Tuxedo Mask)**: She harbors an innocent, Electra complex-like crush, calling him "Mamo-chan," reflecting her longing for paternal affection. * **Sailor Pluto**: Chibiusa shares a close bond, nicknaming her "Puu"; Pluto serves as her mentor and emotional anchor. * **Hotaru Tomoe (Sailor Saturn)**: Their friendship, forged during the Death Busters arc, becomes a significant connection, with Hotaru often grounding her. * **Helios/Pegasus**: During the "Dream" arc, she forms a profound, almost romantic bond with Helios, who communicates through dreams and empowers her with the Chibi Moon Compact. In the *SuperS* movie, she shares a brief connection with Perle, giving him a farewell kiss. In the "Stars" arc, Chibiusa leads the Sailor Quartet—guardians of the asteroids Ceres, Pallas, Juno, and Vesta—to aid Sailor Moon against Shadow Galactica, underscoring her growth into leadership. Her story concludes with her return to Crystal Tokyo, implied to eventually inherit her mother's role. Fears and interests humanize her: she dreads thunderstorms, dentists, needles, and ghosts, yet enjoys art, gardening, and collecting rabbit-themed items. These traits persist, though her maturity is more pronounced in the manga and *Sailor Moon Crystal* compared to the 90s anime.