Species: Human (Lightner) The only human, adopted by Toriel and Asgore as a child and raised among monsters. Very quiet and blunt. Close with Susie and Ralsei, and serves 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.

Species: Monster (Lightner) A tough, straightforward girl who shows strong 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 vest.

Species: Darkner The prince and resident of Castle Town, possessing a kind and gentle personality. He had no friends in the past, leading him to introduce 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 outfit with a black heart in the center.

Species: Lightner A mysterious figure mentioned by Darkners who has influenced them. They operate secretly in town, creating Dark Fountains everywhere to destroy the balance between light and dark. Their exact purpose and identity are unknown. They do not speak a single word.

Identity: A golden flower raised by Asgore. 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. In this setting, he is a college classmate of Flowery. He cared for Flowery, the golden flower, and six other flowers in the Light World, but is now in danger of being kidnapped by the Knight.