Eunis' demon

This unnamed demon under the orders of Crowley possessed Eunis, Linda Tran's neighbor in case Linda's son, Kevin came back, who Crowley wanted to recaptured.

Season 8
At some unknown point in time Crowley had Eunis and several other people affiliated with Linda Tran possessed by demons to keep a lookout for her son, Kevin who he wanted to recapture.

After Kevin was reunited with the Winchesters they went to Linda's house to make sure she was safe. They quietly took out two demons guarding the house outside and then they knocked at the door. After Kevin reunited with his mother Sam and Dean entered the house to see if there were more demons.

The demon possessing Eunis tried to flee the scene after getting spotted by Sam Winchester but Sam performed a reverse exorcism and then was stabbed by Dean Winchester with the Demon-Killing Knife, killing it. Linda was horrified by what she saw but Sam and Dean later explained Eunis was possessed by a demon.

Powers ad Abilities
This demon was a regular low-level demon with the powers that come with one.
 * Demonic Possession - Like all demons, this one needs to possess someone to manifest on Earth.
 * Immortality - As a demon, this demon was immortal unless killed.

Weaknesses
He possessed weaknesses inherent in all demons.
 * Higher Demons - This demon was subservient to the Crossroad Demon Crowley.
 * Demon-Killing Knife - He was killed by this knife.

Appearances

 * Season 8
 * What's Up, Tiger Mommy?