|Birthday Date||August 27|
|Debut||Episode 1 - I'll Become The Top Idol!|
|Singing Voice||Yuna from STAR☆ANIS|
|Theme Song(s)||Watashitachi no Mirai e|
Dance at Sunrise
|Aura||Purple butterflies, pink jewels, coins|
|School Coord||Violet Love Coord|
Masami has brown hair that hangs just below her shoulders, and has purple eyes. She is usually depicted wearing her school uniform. Whenever she is in public, Masami wears a lavender shirt and a dark purple floral skirt, and she also wears black knee-high boots. She also wears gold bracelets on both of her wrists.
Masami loves to sing and dance, and dreams of becoming the top idol of Starlight Academy. She is very elegant and beautiful, and is confident in her abilities. She is best friends with Shinju Umino, even though they are complete opposites. Masami also comes from a rich family, and thus speaks in a formal manner and is very sophisticated.
Shinju Umino - Masami and Shinju have been best friends since childhood, and both are roommates at Starlight Academy.
Amanogawa (天ノ川): Ama (天) means "sky", No (ノ) means "in" while Gawa (川) means "river".
Masami (雅美): Masa (雅) means "elegant" while Mi (美) means "beauty".
Therefore, her name means either "river in the sky elegant beauty" or "Milky Way elegant beauty".
Masami's singing voice actress, Yuna from STAR☆ANIS, has provided her voice in image songs for Masami.
- Lalala Aikatsu Start! (along with Mona, Remi and Eri from STAR☆ANIS)
- Egao o Arigatou ~BRAND NEW DAY~ (along with Mona, Remi and Eri from STAR☆ANIS)
- Masami shares her singing voice with Ran Shibuki, Kaede Ichinose, Kii Saegusa and Shion Kamiya.
- Her zodiac sign is Virgo.
- Just like her predecessors, Masami was inspired by the previous central protagonist to become an idol.
- Her aura is composed of butterflies, jewels and coins.
- Masami is unlike the former central protagonists in a few ways:
- Masami is a sexy-type idol.
- She is more into the elegant and sophisticated part of being an idol.
- She is from a rich family.
- Her theme colour is purple.
- Her aura has no flowers in it.