Dermott Culp's demon

This unnamed demon possessed Dermott Culp and ended up becoming a minion of the Prince of Hell Dagon. This demon also used Dermont's car to get around.

Background
In 2016, this demon possessed the real Dermott and began using his car to get around. The human Dermott was reported missing after his possession.

This demon eventually fell into the employ of the Prince of Hell Dagon. Dagon hired this demon to cover her tracks, which he started off doing by burning down the warehouse she met with Kelly Kline in.

Season 12
In The British Invasion, this demon was sent by Dagon to kill Dr. Turner and erase his records of Kelly Kline after Kelly insisted on getting an exam for her baby.

At the same time, hunter Eileen Leahy investigated the fire this demon caused at Dagon's warehouse by running the license plates of all the cars that drove by using nearby security cameras. Eileen eventually found Dermott's car and how the human Dermott was a missing person. Eileen is able to track Dermott's car to Iowa where she finds this demon disposing of Dr. Turner's body in a dumpster. Eileen confronts the demon, armed with an angel blade. Eileen is able to defeat this demon and kill him by stabbing him in the heart with her angel blade, but not before this demon explains his work for Dagon and gives her Kelly's phone number.

Powers and Abilities
This demon appeared to be a regular low-level demon with the powers of one.
 * Demonic Possession - As a demon, this demon needed a vessel to walk the Earth. He possessed the real Dermott Culp.
 * Immortality - As a demon, he would never age or die unless killed.
 * Invulnerability - As a demon he was invulnerable to normal methods of harm.

Weaknesses

 * Holy Water - As a regular low-level demon, he could be hurt by holy water.
 * Exorcism - As a regular low-level demon, he could be exorcised.
 * Devil's Trap - Like all demons, he could be bound by a devil's trap.
 * Higher-Tier demons - As a low-level demon, he was subservient to and weaker than higher level demons.
 * Demon-Killing Knife - As a low-level demon, he could be killed with the knife.
 * The Colt - Can kill demons.
 * Angel Blades - He was killed with this weapon.
 * The First Blade - It can kill demons.
 * Death's Scythe - It can kill anything in existence.

Appearances

 * Season 12
 * The British Invasion

Trivia

 * Given the fact that the demon used his vessel's car to get around, he presumably can't teleport.