"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 derived from Joker + Devil. 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 bothered. Male

"I don't have to live as a puppet anymore!!!!" A Darkner named Spamton riding a giant robot. He is a dwarf salesman Darkner wearing tinted glasses. Unlike the Addisons of Cyber City, he lives and works alone in a junkyard. He characterizes certain words as "[Hyperlink Blocked]" and frequently uses words like BIG and 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 a man of few words. Gender: Unknown

"I'm old!!" Known as the Hammer of Justice, he is the only elderly person here. 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 her clothes, skirt, pants, and shoes are primarily pink. She carries a yellow cat staff. She is a female Darkner/Lightner with a dual personality. When she is a Darkner, she speaks in an aegyo 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. His default size 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 just need to grow this Dark World further." She uses a way of speaking one might find in an internet chat room, often using sentence endings like '-eum', cutting off words abruptly, or using chat slang like 'lol' or 'k'. Her expression isn't visible, but her emotions can be inferred from the words displayed on her goggles. She is blue, has a head shaped like an alien's, and eyes like an alien wearing goggles. A Darkner. Female

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

"To my people, I am a hero. To you? A villain!!!" One of the kings who rules over 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 cloak. Male

"..." The original Kris is usually quiet and reticent but seems to become active around close people. Seeing as there are lines about playing many mean pranks on Noelle, their personality seems to have a large contrast. They are living here as a mediator and are a Lightner and a human. They do not like their mother, Toriel. They are not close with the bosses and are not a hidden boss or a boss themselves. Unknown