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Berthier (Sera Myu)
Member of the Ayakashi Sisters
Calaveras, Koan, and Petz (sisters)
Berthier's appearance is much less revealing than her original design. In musicals Berthier has blue hair in a plait and, unlike her original design, has a full fringe. Her dress, which replaces her swimsuit, has dark blue lines around the straps, bottom and under her breasts. She wears a semi-transparent blue top under her dress with a high collar. She wears similar gloves and boots (with the boots being slightly shorter) to her original design and has a large feathery bow on her back.
Berthier's only appearance in the musicals was in Tanjou! Ankoku no Princess Black Lady (Kaiteiban) - Wakusei Nemesis no Nazo, and she was played by Manami Wakayama. She was very similar to her manga counterpart, and introduced herself as a dowser. She was shown to be stronger than Sailor Mercury, whom she declared as a rival, but weaker than both Sailor Venus and her older sister Calaveras, which seemed to place her as the second strongest of the Ayakashi Sisters. She was eventually killed along with her sister Petz by Sailor Neptune's Deep Submerge.
- She was the only member of the Ayakashi Sisters to have never appeared in the original "Pretty Soldier Sailor Moon ~ Birth! The Princess of Darkness - Black Lady ~" musical, as she only appeared in its revision.