Roto Koshizaki is a virtual streamer (VTuber) affiliated with Nijisanji, a prominent Japanese virtual YouTuber agency. As a character, Roto is energetic and friendly, engaging fans with a variety of content such as gaming, chatting, and singing streams. Roto's visual design features a modern, youthful aesthetic, and the character's personality is often described as approachable and cheerful. In the Nijisanji universe, Roto plays the role of a supportive member of the group, fostering community interaction and entertainment.