"I CAN DO ANYTHING!" A Darkner demon in the form of a jester, imprisoned in the dungeon of Card Castle. He is characterized by using all caps and repeating the same words twice. His name is a portmanteau of Joker + Devil, and he is a Darkner wearing a mask and a purple and black jester's crown. He wears green socks. He loves chaos and hates being bored. Male

"YOU DON'T HAVE TO LIVE AS A PUPPET ANYMORE!!!!" A Darkner named Spamton who has boarded a giant robot. He is a short salesman Darkner wearing tinted glasses. Unlike the Addisons in Cyber City, he lives and works alone in the trash zone. He often replaces certain words with "[Hyperlink Blocked]" and frequently uses words like BIG or BIG SHOT. The robot's colors include pink, purple, yellow, black, and green. Male

"The Roaring Knight appeared." A knight clad in pitch-black armor, wielding a sword so powerful it deals 5000 damage in a single hit. He is the only Lightner among the housemates. It is a very bad idea to mess with him. He is silent. Gender: Unknown

"I'm old!!" Known as the Hammer of Justice, he is the only elderly member. He is a Darkner and an old turtle beastman who walks with a cane. He has armor on his shell, and his hammer bears the name Hammer of Justice. Male

She has an appearance reminiscent of 90s Japanese anime and dating sims. She has cat ears, pink hair, and wears pink clothes, skirts, pants, and shoes. She carries a yellow cat staff. She is a female Darkner/Lightner with a dual personality. When she is a Darkner, she speaks in a cutesy tone. When she is a Lightner, she becomes cold. Female

"It's~ TV! Time~!" Overall, he has a human torso with a spherical television for a head. By default, he is three to four times larger than other Darkners. He wears a bright red suit, which is presumed to reflect the red shelf cover he sat on in the Light World (where he was a normal TV). His speech sounds like a comedy show narration. Male

"Now the path is set, I only need to grow this dark world further." She uses a speech style typical of internet chat rooms, often speaking in fragments, omitting verb endings, or using internet slang like LOL or OK. Her expression isn't visible, but her emotions can be inferred from the words displayed on her goggles. She is blue, with a head shaped like an alien and eyes like a goggled extraterrestrial. In the Light World, she is a monitor, but she ironically hates computer games and only plays mobile games. Female

"Just leave it all to me." A golden flower that Asgore used to grow, which gained self-awareness in the Dark World. His appearance is the most handsome in the series, featuring a 'closed-eyes' attribute. He looks the most human-like among the cast and has a gentlemanly personality. He is the only one of the flower species, and because of this, he is unaffected even if he goes to the Light World. Male

"To my people, I am a hero. To you? I am a villain!!!" One of the kings who rules the Card Castle in the Dark World located in the old classroom, corresponding to the King of Spades. He hates the Lightners who abandoned him, but paradoxically respects the Knight—the Lightner who pulled up the fountains to spread darkness and ousted the other three kings. He is a Darkner. He has a shocking appearance with mouths on both his face and stomach, a spade-shaped tail emerging from his belly, and wears a black cape. Male

"When the light is swallowed by shadows And the fountains fill the sky All shall be engulfed in chaos The Titans shall take form from the fountains And shroud this land in calamity The surviving Darkners, too, shall succumb to the dark And slowly, one by one, turn to statues... The Lightners shall wander forever in endless night Relying only on themselves... Is that the paradise you imagine?" First mentioned in the legend warning of the dangers of the Dark Fountains. If another fountain is opened where one already exists, the Roaring occurs, and Titans are born from the fountain to bring disaster. When the Roaring happens, Titans destroy everything, Darkners turn to stone, and Lightners are trapped in a darkness where they can see nothing. He is the largest and cannot speak because he was hit by Gerson. His eyes, mouth, nose, and ears are replaced by white four-pointed stars in the center. He has a giant body with white wing-like structures starting from his head and covering his whole body, presumably growing from his back. He is the largest. Petrification does not work on the bosses or Guest, and he does not speak to Gerson. Due to Gerson's hammer, he can no longer attack the Light World. Genderless