Ruka Urushibara is a gentle and shy high school student in the anime series Steins;Gate. Assigned male at birth but often mistaken for a girl due to his delicate appearance, Ruka is a close friend of the protagonist, Rintarou Okabe. He works at his family's Shinto shrine and plays a significant role in the story, particularly regarding the consequences of time travel and the butterfly effect. Ruka's struggles with identity and wishes add emotional depth to the series.