- Heartful Echo's Codename: Celestial Lune! is the first installment of
- Hoshizora Hikari
- Hikari is the lead character of Codename: Celestial Lune!. She's a clumsy girl as she doesn't focus on her surroundings often. Even so, she's sweet, bright and caring, looking our for others then herself. She is also shown to be very agile, quick-minded and honest. Using her celestial ring, she can turn into Celestial Lune.
- Shiori Mizuki
- Mizuki is the second lead in Codename: Celestial Lune!. Unlike Hikari, Mizuki he spends a lot of time focusing on most things, usually helping Hikari form falling on her face. He's polite, clever and loyal, especially to those he cares about. Using his celstial ring, he can turn into Lunar Masque.
- Hikari's partner. She helps her transform into Celestial Lune.
- Mizuki's partner. He helps him transform into Lunar Masque.
- Hinata Miyuki
- Hikari's best friend. A fan of Celestial Lune and Lunar Masque.
- Yoshida Nao
- Mizuki's best friend. A fan of Celestial Lune and Lunar Masque.
- Seiun - The town that Hikari, Mizukim Miyuki and Nao live
- Celestial Rings - Celestial Rings are the main transformation item of the series
- Codename: Celestial Lune! Episodes
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