"I can do anything!" A Darkner demon in the form of a jester, imprisoned in the dungeon of the Card Kingdom. He is characterized by using all caps and repeating the same words twice. His name comes from 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 bothered. Male

"I DON'T NEED TO BE A PUPPET ANYMORE!!!!" A Darkner named Spamton riding a giant robot. He is a short salesman Darkner wearing tinted glasses. Unlike the Addisons of Cyber City, he lives and works alone in the trash heap. He often replaces certain words with "[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 an incredibly powerful sword that 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 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 is named the Hammer of Justice. Male

She has an appearance reminiscent of 90s Japanese animation and dating sim games. With cat ears, pink hair, and pink clothes, skirts, pants, and shoes, pink is her main color. She carries a yellow cat staff. She is a dual-personality Darkner/Lightner. 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 state 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 the narration of a comedy show. Male

"The path is set now, I just need to grow this Dark World further." She uses a way of speaking typical of internet chat rooms, often using sentence endings that drop subjects, cutting off words, or using chat slang like LOL or OK. Her expressions aren't visible, but her emotions can be inferred from the words that appear on the goggles she wears. She is blue, has a head shaped like an alien's, and eyes like a goggled extraterrestrial. Darkner. Female

"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 among the characters in both the previous and current works, possessing the closed-eyes trope. 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 even if he goes to the Light World. Male

"To my people, I am a hero. To you? 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 drove out the other three kings. He is a Darkner. He has a shocking appearance with a mouth on his stomach, a spade-shaped tail coming out of 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 wrap this land in calamity Even the surviving Darkners shall yield to the darkness And slowly, one by one, turn to stone... The Lightners, relying only on themselves Shall wander forever in the endless night... 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, the 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 a white four-pointed star in the center. He has a giant body with white wing-like structures starting from his head and covering his entire body. These wings are presumed to grow from his back. He is the largest. Petrification doesn't work on the bosses or Guest, and he does not speak with Gerson. Genderless