Sam Winchester

 Samuel "Sam" Winchester is a hunter as well as a Man of Letters, partnered with his older brother Dean, and one of the leads of Supernatural. In addition to being Dean's younger brother, Sam is the second son of John and Mary Winchester, the older paternal half-brother of Adam Milligan, the grandson of Samuel and Deanna Campbell and Henry Winchester, and the third cousin of Gwen and Christian Campbell. Early in Season 5, Sam is revealed to be the true vessel of the fallen archangel Lucifer, making him an abomination in the eyes of most celestial beings, with the exceptions of God and Castiel, among others. In Season 8, he undertook a trial in an effort to close the gates of Hell. As of season 9 Sam, Dean and Castiel are on a quest to stop the fallen angels lead by Bartholomew and the rising demon army lead by Abaddon while (unknowingly) serving as the vessel for Gadreel, who was masquerading as the late Ezekiel. However after Kevin was killed by Gadreel, Dean and Cas teamed up with Crowley to expel him from Sam while they continue to find a means of stopping all out angel warfare.