|Occupation||High School Student|
|Relations||Manager Kanau (older sister)|
|Manga||Chapter 108 (Umaru and Prize)|
|Anime||Season 2 Episode 7 (Umaru and Amusement Parks)|
|Japanese voice||Inori Minase|
Hikari has long white hair. She appears to have white eyelashes. She usually wears her school's uniform of white with red and sleeves, due to her small physique, the sleeves extend further than her arms but nevertheless leaves them as they are.
When visiting the Doma residence, it's shown that she doesn't get along with Umaru as both fight for the Taihei's attention, as a result Umaru and Hikari are not in good terms with each other.
Hikari lives alongside her sister in a large apartment, during her childhood, Taihei would occasionally visit them and taught Hikari whilst there, over time, she grew fond of him and would frequently think about him even when he no longer visited her.
While attending high school, her sister sent Alex to spy on the Taihei's apartment and bring back any information on the household. With this knowledge, she visits the Domas on Tuesdays (which Umaru refers to as 'Bread Day') when Kanau works overtime.
- She appears to know of Umaru's inner persona.
- Hikari recognizes most constellations as she remembers Taihei teaching her.
- In manga, Hikari's character can be seen earlier when Alex visiting Umaru in Chapter 75. The character looks more mature.
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