A normal version of Mark Clayton..

A monster from Mark's nightmares.

Casey's genius cousin, and Third Son member.

Kira's doppelganger and EARS agent.

Theo's brother, eldest Nessos sibling.

The scion of a powerful real estate family.

The persistently unpaid intern at The Daily Tuba.

An early retail magnate, also known as "The Creator", currently trapped in the Infinite Hallway.

Captain of EARS security.

Theo's older sister, twin to Katerina.

The silent coachman and guide of There

The naïve, powerful Voice that resides in the Infinite Hallway.

A woman with extraordinary powers and leader of The Invisible Family.

Theo's violent older brother.

A hotshot agent on Casey Davis' EARS team.

A charming stoner ghost who resides in Mark's head.

Kira's former mentor and surrogate father.

EARS-appointed psychotherapist.

An EYES agent masquerading as a Doctor.

A talking Doberman with a small halo

A young and capable EYES agent.

Very famous electronic musician who sucks.

Stroud family patriarch.

A deadly shapeshifting assassin who killed Casey's first love.

A wealthy, Mexican tech geek who purchased the haunted Stroud mansion.

An all-knowing, otherworldly, nearly formless being of nigh-infinite knowledge who offers inscrutable instructions to the Invisible Family.

A young man with Dawnbreak and steadfast supporter of Kira.

A fierce EARS agent with Casey's team.

Duluth handyman / problem solver / monster hunter

An ogre Prince of There

Theo's older brother from Chicago.

Nick and Tommy Sparks' mother

A disoriented young man who speaks only in prophetic gibberish.

Current head of the Stroud company

Casey's older brother and fellow EARS agent.

a rich, power-hungry man whose wish for knowledge to survive created the Third Sons phenomenon.

A young boy with immense power and 1/4 of the Invisible Family.

Theo's older sister, twin to Cathline.

Mark and Kira's boss, editor of the Daily Tuba newspaper.

Mark Clayton's pet owl.

Mark's friendly neighbor and bird sitter

A Chicago-based EARS agent.

Former leader of The Under the Stairs Kids and Tiff's ex-girlfriend.

A skilled mage and owner of the Clockwork Child

A ghost haunting Mark

A blood mage who supposedly died hundreds of years ago.

A man with extraordinary powers and member of The Invisible Family.

The illegitimate daughter of Ezekiel and Loretta Stroud.

One of Kira's alters, a prison warden.

A wealthy, power-hungry man from the bastard Stroud line and leader of the Order of the Black Rose

A veteran monster hunter and hard-line brawler.

A deadly marksman and hitman for hire. Dead.

A young sorceress who was possessed during a séance to contact Marinette Jones.

By all accounts, a legitimate businessman.

The King of the Sky Kingdom

The clairvoyant leader of Dawnbreak. Looks like a young girl but is in fact over 100.

Mark's mother.

Tommy's ex-girlfriend and sire. Killed by Casey Davis.

An agent on Casey's EARS team, skilled in technology.

A prominent painter from Duluth.

Casey's first love who was murdered as a teenager. Her ghost still haunts the site of her death.

Casey's surly boss at EARS.

Elemental guardian of blood and bloodshed

A Chicago-based archmage/mafia boss

The Director of EARS.

The King of the Star Kingdom

A Guardian who represents and controls Shadow. Served by Captain Torres

A monster hunter, werewolf and Kira's boyfriend.

Casey's eldest cousin and former state Trooper.

A kind man with mysterious powers. One of the four members of the Invisible Family.

Elementomancer working with the Order of the Black Rose

An intelligent, squat frog-man with a wide straw hat.

A young, tough woman who wields a baseball bat emblazoned with a dragon.