Yuki Suo is the main protagonist of the light novel and anime series 'Tokidoki Bosotto Russia-go de Dereru Tonari no Alya-san.' He is a high school student known for his calm and somewhat introverted personality. Yuki sits next to Alya, the beautiful and popular half-Russian girl, and often overhears her muttering affectionate words in Russian, thinking he doesn't understand. However, Yuki is secretly fluent in Russian, leading to many comedic and heartwarming moments as their relationship develops. He plays a central role in the unfolding romance and daily school life.