Princess Rubina

プリンセス・ルビナ

Princess Rubina was an anime-exclusive character. She served as the princess and ambassador of the Amethyst Kingdom, appearing only once in the episode "Holiday in Juuban! A Carefree Princess."
Princess Rubina was first mentioned at the start of the episode when reports indicated she was missing from her hotel prior to an international conference held in Tokyo. She first appeared before Usagi and Chibiusa while they were arguing over carrying packages, and inadvertently frightened them away by performing a custom of her country in an attempt to help. However, she followed them to their home and later accompanied them to a festival they had planned to attend.
Although Rubina enjoyed the festival, she got into trouble when she gave away balloons without paying for them. Following this incident, she expressed her desire to be normal and free from her royal status, then ran away. She eventually bumped into Mamoru, who reminded her that her people were worried about her and convinced her to stay with Usagi and Chibiusa a little longer to consider her decision.
Rubina attracted the attention of the Amazon Trio. Tiger's Eye called her "old" and refused to pursue her mirror, leaving her to be attacked by Hawk's Eye. She was saved from him and the Lemures Elephanko by Sailor Moon, Sailor Chibi Moon, and Tuxedo Mask, who returned her to her embassy after the festival ended.
Princess Rubina longed to be free of her royal duties. She was shown to be slightly whimsical and a little strange by most standards, but kind. As suggested by her actions in the episode, Princess Rubina was willing to help people if she saw a problem.
Her kindness was unfortunately hindered by her country's customs (such as covering a man's mouth when asking for help), which scared some people away. She was also hindered by a complete lack of street smarts; having been completely sheltered as a princess, Rubina lacked the ability to understand concepts such as money, privacy, and even language, which attracted undue attention.