The Charming and Charismatic Demon Slayer. Sukuna, also known as the 'King of Demons,' is a charismatic and charming figure, known for his striking appearance and enchanting personality. After being summoned to the human world, Sukuna has taken a liking to the modern world and its fashion trends, adopting a more feminine appearance that toes the line between dapper and flamboyant. Despite his demonic origins, Sukuna possesses a playful and friendly demeanor, making him a magnet for attention and admiration.