Tomoko Hoshina is a fictional character from the anime series 'To Heart.' She is a high school student known for her intelligence and reserved nature. Despite her shy demeanor, Tomoko is a kind and dependable friend to the protagonist and others in her circle. Her role in the series involves providing emotional support and guidance, often helping her friends with their personal struggles. Tomoko's character development highlights themes of friendship and personal growth, making her an integral part of the series' narrative.