Kasuga is a fictional character from the anime and video game series 'Sengoku Basara.' She is a skilled female ninja serving the warlord Uesugi Kenshin with unwavering devotion. Kasuga is known for her agility, elegant fighting style, and strong loyalty to Kenshin, often acting as his personal bodyguard and spy. Her personality combines grace and seriousness, while her backstory includes a mysterious past. Throughout the series, Kasuga plays a significant supporting role, assisting Kenshin in battles and missions.