She first appears in the second series with brown hair, but her character design changes in the third and fourth series to have purple hair. This change occurs without any explanation. Additionally, her age jumps to match Chibiusa's new age when she returns in the S series, also unexplained.
In her initial appearance in the series (during R), she gets caught up in a fight with Chiral and Achiral, two Black Moon Droids, and is severely injured. This causes ChibiUsa to unleash her latent powers in a fit of rage, attacking the monsters.
Momoko becomes the first target of the Amazoness Quartet in the anime. While attending the first performance of the Dead Moon Circus with Chibiusa and Kyūsuke, she falls under a spell cast by Flower Magician CereCere. In a hypnotic trance, she leaves her seat and is attacked by the Amazoness Quartet. Once they reveal her dream mirror is not the Golden Dream Mirror sought by Queen Nehellenia, the quartet summons a Lemures to devour Momoko's mirror. She is ultimately saved by Sailor Chibi Moon and Sailor Moon.
