Hoshimaru Mahiru

(星丸まひる) is the lead cure of Starlight☆Hearts Precure!. Mahiru is a nerdy and usually quiet girl from Yozora. Despite being quiet, Mahiru has a creative mind and big heart, and will do anything for her friends.

As Cure Cosmo, she represents hope and wisdom and her theme color is purple.

Her catchphrase is "Never Give Up Hope!" (決して忘れない希望！).

Personality
Mahiru is a nerdy and usually quiet girl from Yozora. Despite being quiet, Mahiru has a creative mind and big heart, and will do anything for her friends.

As well as this, she usually displays great intelligence and wisdom.

Cure Cosmo
Cure Cosmo (キュアコスモ) is the Pretty Cure alter ego of Mahiru who represents hope and wisdom whilst her theme color is purple. To transform, Mahiru needs her Space Heart Commune and needs to shout "Precure! Shine Bright!". Her main attack is Cosmo Gleam.

Transformation
The transformation begins with Mahiru opening up her Space Heart Commune. She then taps the rose three times and shouts "Precure! Shine Bright!". After, she rises the commune in the air and it emits a bright glow, transforming the surrounding area into the transformation background. Several beams of amethyst-colored light then shoot out of the commune and, as she spins, two of the beams form her midriff baring top. Then, as she jumps, the remaining beam of light forms her skirt. Afterwards, she taps her feet together and her boots appear whilst also clapping her hands to make her gloves appear. Her hair then grows longer and it pulls itself into twintails whilst shifting to a pale amethyst. Finally, her bow with the Starlight☆Hearts insignia appears and she recites her introduction speech as she finishes with her transformation pose.

Attacks

 * Cosmo Gleam (コスモグレアム) - Cure Cosmo's main attack. She first performs it in episode 01.

Etymology
Hoshimaru (星丸) means "star circle" with 星 (hoshi) meaning "star" and 丸 (maru) meaning "circle".

Mahiru (まひる) has no specific meaning in hiragana however, the kanji 真昼 (Mahiru) means "broad daylight" or "midday".

Therefore, her name means "broad daylight star circle" or "midday star circle" if using the kanji for Mahiru.

Cure Cosmo means "a prefix relating to the world or the universe"

Songs
Mahiru's voice actress, Suzuki Konomi, has participated in several character songs for the character she plays.