Guren Ichinose is a major character in the anime series 'Owari no Seraph' (Seraph of the End). He is a lieutenant colonel of the Japanese Imperial Demon Army and the leader of the Moon Demon Company. Guren is known for his strategic mind and leadership skills, playing a crucial role in humanity's battle against vampires. Despite his cold and ruthless demeanor, he deeply cares for his subordinates. Guren's complex past and connections to various characters add depth to the series' narrative, making him an enigmatic and pivotal figure.