Rodger's wife's demon

This unnamed demon possessed the wife of Rodger, who was Jimmy Novak's neighbor in order to hunt down Jimmy, due to being the angel Castiel's vessel thus ending Castiel's time on earth due to losing his perfect vessel.

Season 4
When Castiel and his vessel Jimmy Novak were forcibly separated by the angels, this demon along with another demon decided to hunt Jimmy down by possessing his neighbors, Rodger and his wife.

Soon after Jimmy returned home to his family, Rodger paid him a visit and successfully took Claire hostage. While Jimmy pleaded for his daughter to be spared, this demon snuck up behind him and viciously attacked him. Amelia tried to throw her off, but the three were distracted by the arrival of Dean Winchester.

Dean slit Rodger's throat with the demon-killing knife, saving Claire. This demon turned her attentions on him, but was halted by Sam, who tried to use his powers to exorcise her but found he could not, as he lacked the "juice".

The demon taunted Sam, until Dean intervened and tried to stab her. To avoid death, the demon fled from Mrs. Rodger, who dropped to the ground, either dead or unconscious.

Powers and 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.
 * Superhuman Strength - As a demon, this demon is stronger than most humans, monsters and ghosts. However, he is not particularly strong as a stronger human such as Sam Winchester was able to overpower him with ease.
 * Immortality - As a demon, this demon was immortal unless killed.

Weaknesses
As a regular demon, he possessed the weaknesses all demons possess.
 * Devil's Trap - Like all demons, he could be confined within a devil's trap.
 * Exorcism - As a regular low-level demon, this demon could be exorcised.
 * The Colt - Like all demons, he could be killed by the Colt.
 * Demon-killing knife - Can kill demons.
 * Angels - Angels can easily kill low-level demons.
 * Angel Blade - Can kill most if not all demons.
 * The First Blade - Can kill anything in existence.
 * Death's Scythe - Can kill demons.

Appearances

 * Season 4
 * The Rapture