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|Affiliation||Kaibara Municipal High School|
|Japanese||Miwa Matsumoto (2001)|
Rika Aida is a member of the Prince Yuki Fan Club and a good friend of Motoko Minagawa. She adores Yuki Sohma and can pick any lock. Although she encourages to protect Yuki, her ideas differ from other Prince Yuki Fan Club members. By protecting Yuki she insists he be free.
- She share shares her English voice actress with Momiji's Mother.