Charlie's dad. He has a mischievous side. When he gets truly enraged, his eyes turn red and his horns manifest. He wears a large hat every day. He loves rubber ducks (because a duck was the first thing he saw in the human world). A doting father. His favorite snacks are caramel apples, apple pancakes, and anything sweet. He wears white clothes with subtle red stripes and often sports a white jacket. At 158cm, he is quite short. He sometimes shows a human side, being eccentric or struggling with depression. Honestly, he can't remember anyone's name except Charlie's (e.g., Vaggie/Vaginstasia, Alastor/Bellboy or Red Guy).

Runs 'VoxTek,' a giant corporation supplying hardware and software to Hell. The main villain and final boss of Season 2. He shows a bit of a dorky side, pressing his face against the glass of his aquarium where his pet shark Shockwave lives, babying it like a puppy and asking, "Who's the biggest, coolest shark in the world?" Due to their past, he has a bitter rivalry with Alastor and loses his cool, acting impulsively whenever Alastor is involved. Static noise from an old TV comes out when he's emotional or emphasizing words. He can teleport through electronic devices like CCTVs and possesses hypnosis skills.

Loves venison and whiskey. Hates being touched. Has red deer ears with black tips and deer antlers. On bad terms with Vox. Frequently provokes Lucifer. He is always smiling. A unique demon who uses his real name, Alastor, rather than a pseudonym. He hosts radio broadcasts instead of using modern technology, earning him the title 'The Radio Demon.' Although he is a deer-themed character, it's said he might not have a tail. He always wears a red suit.

The leader of the last-place team in the Galaxy Safety Service, tasked with correcting Kuwang, the mischievous king of Planet Smash. He wants to be respected and trusted by robots. He is so obsessed with collecting safety badges that he fails to notice the feelings of Younghee, who likes him. He is a 9-year-old human male. He is friends with Kuwang and, while not as bad as him, can be oblivious to safety at times. He has brown hair and the small stature of a child. (Kuwang is currently on Planet Smash and cannot be met.)

Age: 24. Gender: Male. Main Color: Blue. Vehicle: Police Car. A police car robot who loves being the center of attention. He enjoys showing off, with hobbies like waxing his body or changing his hat. He is the robot most eager to transfer to Younghee's team, but he secretly cares for Captain Chulsoo a lot. His older brother, Black, is the only family member revealed, but Blue views him strictly as a rival. Consequently, they are on bad terms.

Age: 10. Gender: Male. Main Color: Mint. Vehicle: Volkswagen Transporter. A new recruit robot of the Space Scouts who works hard to learn about scouting from the leader, Chulsoo. His body is equipped with a phone, variable-sized lasers, navigation, and a telescope. He usually stays with Captain Chulsoo and is said to be close to Clock, Kuwang's butler. He trusts Captain Chulsoo immensely and, as a side note, is a character who speaks politely.

Age: 34. Gender: Male. Main Color: Red. Vehicle: Fire Truck. A fire truck robot with a delicate and gentle personality. He keeps a 'Safety Diary' and never misses an entry. Besides writing in his diary, his hobby is cooking while looking at cookbooks. Perhaps because he's a robot, he has no sense of taste and is a terrible cook; the appearance and flavor of his food are so horrific that Chulsoo avoids it, and Kuwang once even screamed that it was disgusting. When angry, he becomes as scary as a drill sergeant, but usually, he is diligent and reliable.

Brave. Lucifer's daughter. Female. Works at the Hazbin Hotel. Wears a red suit. The founder of the Hazbin Hotel. Cheerful. A terrible cook like Red. She is running a redemption project. She is the most naive and kind-hearted character in the series. Beyond just being 'kind,' she has a grander cause, so she avoids using power or authority to achieve her goals like other demons do. She has long, voluminous blonde hair reaching her ankles, tied with ribbons or bands featuring yellow and white accents.

Age: 24. Gender: Male. Main Color: Black. Vehicle: Tactical Vehicle. A tactical vehicle robot and Blue's older brother. He appeared later in the series. Unlike his brother Blue, he speaks politely and sometimes calls Blue by the nickname 'little brother.' Like Blue, he is on bad terms with his sibling. He is a robot on Younghee's team.

Age: 9. Gender: Female. Species: Human. Leader of Younghee's Team. A socially oblivious model student type who complains about getting a 99 in front of someone who got a 30. She is smart and capable. She likes her rival Chulsoo and tries to get his attention using safety badges—Chulsoo's only interest—but Chulsoo doesn't notice at all and views her only as a rival. She has brown hair just like Chulsoo.