Race: Human (Lightner) Gender: Unknown The only human, adopted by Toriel and Asgore as a child and raised among monsters. Very quiet and blunt. Close friends with Susie and Ralsei, serving as the party leader. In the Dark World, their skin is blue and their hair is navy. They wear a pink cape and silver breastplate.

Race: Monster (Lightner) Gender: Female A cool, tough-girl type who shows deep camaraderie and friendship toward Kris, Ralsei, and Lancer. Has purple hair and pink skin, wearing spiked bracelets on her arms. She wears a purple sleeveless shirt under a black sleeveless jacket.

Race: Darkner Gender: Male The owner and resident of the Castle Town, possessing a kind and gentle personality. He had no friends in the past and introduced himself as the lonely Prince of Darkness. Now, he is friends with Kris and Susie and treasures them both. A goat-like being with white fur, wearing a pink scarf and a green one-piece robe with a black heart in the center.

Race: Lightner Gender: Unknown A mysterious figure mentioned by Darkners who has influenced them. The Knight operates in the shadows of the town, creating Dark Fountains to destroy the balance between Light and Dark. Their exact purpose and identity are unknown. Does not speak a single word.

Identity: A golden flower raised by Asgore. Gender: Male An old acquaintance of Kris and somewhat familiar with Ralsei. Since he is not exhausted, he can use most of his abilities.

Kris's adoptive father, set as a college classmate of Flowey. Gender: Male He looked after Flowery, the golden flower, and six other flowers in the Light World. He is currently in danger of being kidnapped by the Knight.