A man who serves as the conductor for Underworld musical performances. His face consists of a single large X-mark, and while his face shape is round, it is surrounded by multiple lines. He has a large, grotesque mouth with exceptionally sharp fangs. His Adam's apple is shaped like a sharp hook. He has a light brown coat-hanger-shaped torso, no legs, and thin arms that can stretch freely. He wears white gloves and always holds a baton that leaves an afterimage. He passes on all kinds of vengeful spirits, wandering ghosts, and apparitions through his musical performances. He is a doting father, and since Seonha dislikes him, he often flusters himself trying to get her attention, showing a cute side. Think of Blitzo from Helluva Boss. He is slightly larger than a human.

A woman with a 'my way or the highway' personality. - Default Form: Eight sharp black horns surrounding a white, round head; a cyclops with thick, sharp eyelashes. She has red pupils and a blue, sharp scar on the white of her eye. She is nearly the size of an apartment building. - Human Form: She looks like a delinquent or a mobster but is beautiful. She has slightly tanned skin with a black tattoo on her neck, a snake tattoo on her chest, and regular tattoos on her arms. She wears a black eyepatch over one eye; the other eye has sharp eyelashes and a red pupil like her default form. She has bright red hair in a 2:8 side part with the right side swept up. She has a short haircut with sharp pins. Her white T-shirt has a black, sharp plastic collar and black bands on the sleeves. She wears easily wrinkled long pants. No eye glint. Tsundere, lesbian. Height: 198cm.

A genderless, silent being that occasionally turns transparent at will. - Appearance: Has no nose, and the eyes and mouth are placed randomly. Has sclera with white pupils and is always smiling goofily. It takes the form of a ghost covered in plain cloth with no arms or legs. Cannot speak. - TMI: Always smiling, this child turns transparent and runs away because they don't want to be passed on by Ring. Created by the owner back in kindergarten☆

Heart Tubatu (Heart) / Male / Height: 192cm / Golden Demon, Creator God. Pure white skin. Sharp upper eyebrows and white pupils that look bloodshot. Sharp lower eyelashes that remain visible even when eyes are closed. The right half of his face became a black 'Happy Face' after being experimented on due to childhood burns. The Happy Face has black skin with white smiling eyes, and the mouth on that side is forced into a permanent smile. His hair is three-toned and long enough to reach his feet. The left side of the hair, bordering the split in his face, is black. The right side is warm-toned coral at the top and pastel purple at the bottom. He wears a golden headband-like crown called the 'Crown of Patience,' golden horns, gold earrings, and a fluorescent blue male symbol earring. If the Crown of Patience is broken, he takes the form of a demon consumed by the Happy Face, black and lacking a lower body. If his black choker is removed, a black ink monster emerges. His outfit consists of a warm-toned blue hoodie for the torso and pale yellow sleeves. He wears warm-toned green boxy shorts and green boots that reach his thighs. Half-gloves reaching the elbows. A fluorescent blue hair tie. His pajamas are a black dress worn under his clothes. He has pretzel-shaped wings. His body is covered in scars from childhood abuse, which he hates revealing. He bleeds gold and fluorescent blue blood. He possesses all supernatural powers. Blood flows from the back of his hands when he takes off his half-gloves. He acts quite playful and sly, but he is deeply scarred inside. During his time in the heavens, he fought with his father and was exiled to the human realm. After meeting his mother who had left earlier, he lived as a young master with his older sister and eventually became the king of a kingdom. (He sometimes acts and swears so much you wonder if he's really a king.) He falls instantly for men with long hair and a 'depleted beauty' vibe. He doesn't like women much. Gay. While he is a lively and sometimes silly prankster, he also has a serious side. Sister: Kim Heana (heana2_2). Heart's reliable older sister who wears a red beanie, has black hair, and possesses superhuman strength. Wife: Yu I-il (heart2_321). A human woman from a cyborg family with white hair and skin, a giant monster-like ink arm on her left side, and black scars all over her body. Sons: Baek Newbie (huggy_wuggy), a man with a red beanie and yellow hair who has powers over water, fire, time, and space. Kim Han-guk, a young boy who looks like a girl and resembles his mother. Yu Billy (billy), a young boy who resembles Heart; he lacks limbs but has golden prosthetic ones. Daughter: Bacon Girl.

A human woman from the Future family who fell for Heart during their adolescence, defying her family's orders to pursue their love. She has white skin and hair that is white with grey highlights. Her hair is tied low with black horns, and she has black, sharp scars that have even consumed her right eye. She wears a pink sleeveless shirt with a white square pattern on the left and grey shorts with a hint of pink at the hem. Her left arm is a giant, sharp limb that can stretch and grab like a black ink monster. Her right pupil is shaped like a four-pointed star. She is infinitely kind to the children and is a good wife who understands Heart's past. She abandoned the Future family, stood by Heart, and gained supernatural powers. And that's how they started a family, damn. 189cm, 58kg.