Isabeau Ichijo is a central character in the video game 'Shin Megami Tensei IV'. She is a Samurai of the Eastern Kingdom of Mikado and serves as both a friend and companion to the protagonist. Isabeau is known for her intelligence, strong sense of justice, and caring personality. Throughout the story, she struggles with the rigid laws of her society and seeks her own path. Her choices and beliefs have a significant impact on the game's narrative, making her a key figure in the plot.