Chibiusa Tsukino is the Crown Princess of the thirtieth century utopia Crystal Tokyo, and is the civilian identity of Sailor Chibi Moon. This is the second animated depiction of the original manga character.
Chibiusa retains the same appearance as she does in the original manga.
Chibiusa first appears in Act 14 - Conclusion and Commencement: Petite Etrangere. She falls from the sky through a time portal and lands on top of Usagi's head, and kisses Mamoru in the process. She introduces herself as "Usagi Tsukino" and asks Usagi why she has the same hairstyle and the same name as her. Realizing that she's found the person she's looking for, Chibiusa pulls out a gun and threatens Usagi to give her the Silver Crystal quickly.
She later uses the mysterious magic of Luna-P to bewitch Usagi's Earth family in accepting her as their relative. She is seen carrying a silver key and another Silver Crystal around her neck.
In Act 16-Abduction, Sailor Mercury, when Sailor Moon attempts to interrogate Chibiusa she runs away, scared. She ends up at a park. At this point it's begun raining so Chibiusa shelters under the slide. She is found by Mamoru later, who brings her back to his apartment. When she wakes up, she shows him Luna P and explains that "Small Lady" is her nickname. When asked about the Time Key, Chibiusa says that she needs the key so she can go home. She then asked Mamoru if Sailor Moon was indeed strong as they said she was.
In the seventeenth episode, she had followed Usagi to the arcade where she easily beat the enemy on the Sailor V video game in seconds. When she saw Usagi's parents together, she recalled how her own mother and father loved one another very much and seemed to have forgotten all about her as well. Hurt and lonely, she had run off to the park where it started to rain.She uses Luna P to manifest an umbrella.
In Act 18-Invasion, Sailor Venus, Chibiusa is playing with her new friend Momoko Momohara when Usagi and the others return from the battle. Spying the Black Moon Earring Mamoru was holding, Chibiusa freaks out. Later on, she steals Usagi's Crystal Star brooch and attempts to return to the future.