In the American version, Chibi-Usa is named Rini, as not to confuse us all. Her name is really Usagi (Serena), but she likes to be called Chibi-Usa (Little Serena). This means Chibi means small, or little. This name thing runs in the family, 3 generations of Serenity’s! Rini lives in Crystal Tokyo in the 30th century, until the Negamoon family wanted revenge on Earth. She travelled back to the 20th century to get the Silver Imperium Crystal, and to find her future mother. She needed the crystal to help defeat the Negamoon family. Wise man helped transform her into the evil Wicked Lady but Sailor Moon rescued her.

In end of Sailor Moon Romantic, she comes back to begin her training as the Sailor Senshi of the future moon. Because she is only small, just a child, her attacks are not very powerful. Her pink hearts only distracts the enemy (when they work), but she can take care of things until others arrive. In Sailor Moon Super Stars she transformed with Serena, and called for the power for Super Sailor Moon's attacks, she was more important. She was the only human that Helios contacted and trusted. She is alot like Serena, but not as much of a crybaby. Her parents are Sailor Moon and Tuxedo Mask.

The Amazoness Quartet actually become her Sailor Senshi in the future.