Hikari Kujou is considered to be the "life" of the Queen, a part of her spirit that appeared when the Queen as a whole broke up into three parts: the Heartiels, the embodiment of her will; Hikari, who represents the Queen's life; and the Queen Chairect, her heart. She has lost all of her abilities and memories from being Queen and is living as a passive human girl. She makes friends and goes to Verone Academy with Nagisa and Honoka and works for Akane Fujita's mobile store. Her alter ego is Shiny Luminous. After the first season, Hikari lost all of her abilities and memories as the Queen and lives life as a passive human girl. She makes friends with Nagisa and Honoka. Typically a very nice, caring, and polite girl, she is also naive due to memory loss. She never gets angry in her regular form, which tends to make some people worry.

Hikari is taken to the Garden of Light in the end, and the Queen reawakens and resembles her transformed form. Later, she grants the rest of the team the final finisher: Extreme Luminaro Max.

She grasps to concept of being Shiny Luminous quite quickly but is always wondering about her past and often stares at the sky.

Having lost all memories of her life as the Queen, Hikari lives life as a passive human girl. Initially a blank state because of this, she comes off as naive, innocent, and wide-eyed while trying to adjust to her sudden life. She quickly befriended Nagisa and Honoka after formally meeting them. Hikari is nice and polite, and very considerate towards others. It's hard to get her upset, and her gentle disposition tends to worry others. She usually keeps things to herself to avoid worrying others or upsetting them.