Samandriel

History
Created at the dawn of time along with the rest of the angels, Samandriel started off as an adorable cherub, gaining favor as he was one of God's cutest creations. He was soon promoted to being a full angel, where he met the angel Todreel, where the two would become romantically involved despite it both being against the rules and having no sexual orientation/genitalia.

When Lucifer rebelled, Todreel chose to side with him. Fearing Todreel would be banished along with everyone who was on Lucifer's side, Samandriel trapped his love in a cave for centuries, ending their relationship, but sparing Todreel from life in Hell.

When God abandoned Heaven, Samandriel found himself tormented by the rest of the angels, led by Michael, who were jealous of Heaven's most adorable angel. Only Castiel reached out to the young angel, offering his friendship.

When the angel tablet's location was revealed, Samandriel possessed the body of a teenager named Alfie to help protect it, only to be abducted and tortured by Crowley. Upon being rescued, a brainwashed Castiel was ordered by Naomi to kill him, sending him to The Empty.

While in the Empty, Azazel's disciple Dawn cast a spell to make Samandriel believe he was in Purgatory along with the other angels and demons, tricking him into casting a spell that would transport him from the Empty to the Cage, where he ended up freeing Adam Milligan. The two ended up escaping Hell and ended up on Earth, where they met Ben Braeden and his group of hunters.

Soon the trio were on the road, becoming hunters in the hopes of crossing paths with the Winchesters in order to confront them about everything that had happened to the trio that led to their deaths and loss. With no grace (and thus no angel powers), Samandriel took to the name Alfie once again and attempted to lead the life of a human.

Upon meeting Jesse Turner the Anti-Christ, Samandriel became determined to regain his lost grace and become an angel again to be of better use to his friends. The search led them to Todreel, who had had the body of a child named Todd who had been sent by Raphael to gather up all the lost grace. After a fight, Samandriel retrieved his grace and became a full angel again.

Finally finding Castiel, the two came to blows with Cas angel warding Samandriel away before he could be told about the grace pool. Upon crashing near Todreel's site, both were abducted by Heaven for various crimes against the host where they now sit in Heaven's prison.

Trivia
Tyler Johnston portrayed both Matt Pike (season 1) and Samandriel (Season 8). When Adam started dating Matt, only Ben seemed to notice the similarities between the two.