Humans

"Humans are full of secret nasties, it's why so many of them end up here."

- Millie describing humans, "Murder Family"

Humans are a sapient species native to the planet Earth. Deceased human souls make up the sinner category of Demons in Hell.

Description
As the primary lifeform on Earth, humans are the only known sapient species to live on Earth, and subsequently the known universe.

Upon death, human souls traverse to either Heaven or Hell, depending on the actions that human's soul took while on Earth.

Human society as a whole is entirely unaware of the true nature of the afterlife, Heaven or Hell. However, throughout Earth's history, the entities of these realms have travelled to Earth and interacted with humans for various reasons, such as business, ritual, pleasure, or more widescale affairs. Humans are often exploited by demons, such as the Succubi species, who use humans to spread sexual activity, but otherwise remain in the dark about these beings. Some fringe groups, such as D.H.O.R.K.S., claim knowledge of the afterlife and Hell. These groups, however, are typically dismissed by most humans, according to Stolas.

Living

 * Employees of D.H.O.R.K.S.
 * Agent One
 * Agent Two

Deceased
NOTE: A deceased human character is one who has died as a human, but, has not been seen in either a demonic or angelic form following their death.
 * Brennon Ragers
 * Counselor Jimmy
 * Eddie
 * Jarold Mayberry
 * Lifeguard Dude
 * Martha's family
 * Martha
 * Ralphie
 * Martha and Ralphie's children
 * Opera Singer
 * Various Spring Breakers
 * Various D.H.O.R.K.S. Agents
 * Various Opera Attendees

Formerly Human

 * Lilith

Angels

 * Adam

Sinners

 * Employees of the Hazbin Hotel
 * Niffty
 * Husk
 * Angel Dust's family
 * Angel Dust
 * Arackniss
 * Angel Dust's father
 * Anchormen of 666 News
 * Katie Killjoy
 * Tom Trench
 * Founders of Lyle-Loopty Robotics
 * Loopty Goopty
 * Lyle Lipton
 * Mrs. Mayberry
 * Sir Pentious
 * Cherri Bomb
 * Baxter
 * Crymini
 * Mimzy
 * Overlords
 * Alastor
 * Vox
 * Valentino

Status Unknown

 * Angel Dust's family
 * Molly
 * Angel Dust's mother
 * Alastor's mother

Trivia

 * According to Faustisse, the voices of Sinners are changed from the one they had as humans, possibly into "whatever fits proper". This detail may be retconned, since this does not seem to be the case with Mrs. Mayberry. Although, her tone is significantly less jovial than her human self's.
 * In the Helluva Boss episode "Murder Family", Martha and her family seem to temporarily take on certain "demonic" traits such as sharp teeth, red eyes, and slit pupils when in a state of evil derangement; these traits vanish as the situation de-escalates. It is unclear if this was a tendency unique to humans such as them, given that they were worshipers of evil forces, or if these traits are likely meant as visual metaphors, and not literal transformations.
 * As confirmed in "Overture", Lilith is the same figure as the biblical Adam's, and is formerly human as well.
 * The Eden family was also hinted at by Vivziepop, but she did not want to talk about them because it will be part of the story.