Akobel

Akobel is a sixth choir Seraphim sent to watch humanity and who married Lily Sunder.

History
Akobel was sent to observe humanity and became fascinated by them. At some point, Akobel met Lily Sunder and married her. Akobel helped to raise Lily's daughter May and protect them from Ishim following their marriage.

Learning of Akobel's relationship with Lily, Ishim, who was obsessed with Lily, decides to murder Akobel and May in revenge. To this end, Ishim claims to his flight that May is Akobel's daughter and a Nephilim, meaning that both would need to be killed. Accompanied by his flight, including Benjamin, Mirabel and Castiel, Ishim confronts Akobel at his home in Orono, Maine. When the angels arrive, Akobel orders Lily to take May and run, knowing why Ishim is there. Ishim berates Akobel for his love of humanity, but Akobel points out that Ishim is being hypocritical and explains why he loves humans. Akobel draws an angel blade and moves to attack Ishim, but is blocked by Mirabel. Castiel then reads out Akobel's "crime" of fathering a Nephilim and Ishim chokes Akobel to keep him from revealing the truth. After Castiel proclaims a death sentence for Akobel, Mirabel kills him with an angel blade. Ishim then confronts Lily for "betraying" him with Akobel and murders May in revenge.

Using Enochian magic, Lily is able to prolong her life and seeks revenge for the murders of Akobel and May. After the Fall of the Angels, Lily seizes her chance and kills two of Ishim's flight. In 2017, she hunts down the remaining four members, killing Benjamin and Mirabel. After learning the truth about Akobel's murder, hunters Sam and Dean Winchester help Lily fight Ishim who is eventually killed by Castiel. Afterwards, Lily is unsure if she will give up on getting revenge for Akobel and May's deaths as it's all she's had for over a hundred years. Castiel apologizes for his role in Akobel and May's murders, offering that if Lily still wants revenge in the future, she can take it.

Powers and Abilities
Akobel was a seraph with all the powers of one:
 * Angelic Possession - As an angel, Akobel required a vessel to walk the Earth. He also required the vessel's permission.
 * Immortality - As an angel, Akobel was immortal and wouldn't die of natural causes.
 * Invulnerability - As an angel, Akobel was invulnerable to most forms of harm.

Weaknesses

 * Angel Banishing Sigil - Like any other angel, Akobel could be banished by the sigil.
 * Holy Fire - Like any other angel, Akobel could be contained by holy fire and would die if he crossed it.
 * Angel Blades - As a seraph, he was vulnerable to an angel blade.
 * Higher-Tier Angels - Akobel was subservient to and weaker than higher-tier angels such as the archangels.
 * Angel Warding - Like all angels, Akobel could be kept out of places by angel warding.
 * The First Blade - It can kill angels.
 * Death's Scythe - It can kill anything in existence.

Appearances

 * Season 12
 * Lily Sunder Has Some Regrets

Trivia

 * He is the first Seraph confirmed since Castiel in season 5.
 * Akobel's relationship with Lily is a rare example of angel-human romance. The closest other example was Anna Milton and Dean Winchester, which ended when Anna made the decision to end Dean's existence in order to prevent the Apocalypse.
 * Like Akobel, Anna had fallen in love with humanity and chose to abandon Heaven, but to the point that she gave up her life as an angel too.
 * His actor previously portrayed Chris in Shut Up, Dr. Phil.