Hikaru Kiyomiya is a male supporting character in the anime Alya Sometimes Hides Her Feelings in Russian. He is a first-year student at Seirei Private Academy and belongs to class 1-B. Hikaru has been a close friend of the protagonist Masachika Kuze and their mutual friend Takeshi Maruyama since middle school.

In terms of appearance, Hikaru is described as a beautiful young man with delicate, androgynous features. He has naturally light brown hair and brown eyes, and his refined looks make him one of the most attractive students at the school, frequently drawing admiring glances from other students.

Hikaru’s personality is laid-back and supportive. He acts as a reliable friend to Masachika and Takeshi, often helping them in small but meaningful ways. For instance, he has shared his textbooks with Masachika when he forgot his own and has accompanied Takeshi to prevent him from feeling left out. Despite his popularity, Hikaru has a complicated history with romance. Due to past problems involving girls, he lost some of his friends, and as a result, he currently has difficulty relating to women and shows no interest in pursuing romantic relationships. He does, however, have a notable reaction when he falls into despair; his friends refer to this state as "Yami Hikaru" or "Yamiru," a playful nickname that changes the character for "light" in his name to the one for "darkness".

Hikaru’s primary role in the story is as a member of Masachika’s close circle of friends. Alongside Takeshi Maruyama, he provides the male protagonist with a familiar social anchor amidst the events involving the student council and the heroines. The Japanese voice actor for Hikaru Kiyomiya is Taichi Ichikawa, and his English voice actor is Joshua Waters. His Japanese name, Hikaru Kiyomiya, consists of the characters for "light" (光) and "lapis" (瑠) as his given name, while his surname Kiyomiya incorporates the characters for "clear" (清) and "temple" (宮).