Bijou Koseki is a virtual YouTuber (VTuber) and a member of Hololive English -Advent-, the third English generation of the popular VTuber agency Hololive. Portrayed as the 'Jewel Golem,' Bijou is endearing and energetic, with a playful personality and a bright, gemstone-inspired design. She acts as the embodiment of pure curiosity and innocence within the Advent group, bringing joy and laughter to her fans through her streams, creative content, and collaborations with other Hololive members.