Ralsei is a dark prince from the Light World in the video game series Deltarune. Known for his polite demeanor and unrelenting optimism, Ralsei possesses a comprehensive knowledge of magic and showcases a remarkable proficiency with Dark Magic. He is a significant ally to the protagonist, Kris, and their friends Susie and Noelle, often providing guidance and support. Ralsei's character balances out the party's other members with his measured calm and keen insights, playing a key role in shaping their adventures. He yearns to be a hero like the legendary Wind Knight but struggles with confidence. Ralsei's design features a mix of dark and royal blue, symbolizing his connection to darkness and his royal heritage. He is a rabbit-like humanoid with a soft-spoken voice and is a devoted follower of the Knight, the legendary hero and ruler of the Dark World.