Chibiusa was the civilian identity of Sailor Chibi Moon and she appeared in the anime and manga series. Her real
name was Usagi, but to prevent confusion, people called her "Chibiusa" ("chibi" (ちび) meaning "small person"; "usa" (うさ) being short for "usagi" (うさぎ; "兎" in kanji), meaning "rabbit"). In Crystal Tokyo she also went by the name Usagi Small Lady Serenity. Chibiusa belonged to the future, 30th Century Crystal Tokyo, and travelled back in time to 20th-Century Tokyo initially to save her mother and again later in the story for training as a Sailor Senshi.

She was the daughter of Neo-Queen Serenity and King Endymion, the future forms of Usagi Tsukino/Serena Tsukino and Mamoru Chiba/Darien Shields respectively, and the granddaughter of Queen Serenity. She had a guardian device called Luna P, and a grey kitten named Diana who was the daughter of the moon cats Luna and Artemis .

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Chibiusa in the anime

When she first arrived in the anime continuity she was around 6 years old, while in the manga continuity she was chronologically 901, but still mentally and physically 6 years old. The delay in her aging was due to the power of the Silver Crystal and the fact that her own powers as a Senshi had not been fully awakened. In the anime, before she gained the ability to transform into Sailor Chibi Moon, Chibiusa also had the power to emit an exrume amount of energy from the cresent moon symbol that could appear on her forehead. She tended to do this when she was alarmed or scared, and the energy column was visible from a distance, which meant that the Black Moon Clan used it as a way of tracking her.