Yuuko Hosaka (穂坂優子), born December 12, 1976, in Yamagata, Japan, was the sixth actress to play Setsuna Meiou/Sailor Pluto in the Sailor Moon musicals. Her first performance was Transylvania no Mori in 2000, and her last show was the Second Stage Final, Kakyuu-Ouhi Kourin.
Yuuko was the longest running Pluto, and the twelfth longest running Myu performer.
- Fellow musical cast members called her "mother" and "Puu," a nod to the character she played.
- Yuuko's favorite colors are purple, black, silver, and red, and her favorite sports are basketball and badminton.
- She has kept in contact with former co-star and Sailor Moon actress Marina Kuroki, who has posted photographs of the two of them together on her blog.
- Kessen / Transylvania no Mori - Shin Toujou! Chibi Moon wo Mamoru Senshi-tachi
- Kessen / Transylvania no Mori (Kaiteiban) - Saikyou no Kataki Dark Cain no Nazo
- Last Dracul Saishuu Shou - Chou Wakusei Death Vulcan no Fuuin
- Tanjou! Ankoku no Princess Black Lady
- Tanjou! Ankoku no Princess Black Lady (Kaiteiban) - Wakusei Nemesis no Nazo
- 10th Anniversary Festival - Ai no Sanctuary
- Mugen Gakuen - Mistress Labyrinth
- Mugen Gakuen - Mistress Labyrinth (Kaiteiban)
- Starlights - Ryuusei Densetsu
- Kakyuu-Ouhi Kourin - The Second Stage Final