Jonah

Jonah, along with Efram was an angel that answered Castiel's prayer for help after he was cursed by Rowena.

After the two angels arrive on Earth where Castiel is, they place him in handcuffs and take him at knife point to an abandoned building, where they reveal they are not taking him to Heaven and proceed to string him up and put a bag over his head.

Jonah begins the interrogation by demanding to know Metatron's location. Castiel claims to not know where Metatron is, and asks for mercy from his angel brethren, but Efram doesn't believe Castiel deserves mercy, with Jonah stating anytime he needs to make a choice between his family or the Winchesters, he chooses the Winchesters.

Castiel's torture continues, with Efram and Jonah trying to figure out whether Castiel is lying, or just stupid about the whereabouts of Metatron. As Efram is about to restart the torture, Hannah bursts through the door and orders Jonah and Efram out of the room. After Castiel realizes that Hannah is working with Efram and Jonah, the two angels re-enter, and Jonah tells Castiel that he is going to hack his brain.

Jonah begins pushing spikes into Castiel's head -- Efram -- unhappy that things are taking too long, steps in and is about to drive a spike into Castiel's skull when Hannah begins to protest, stopping Efram. As Efram begins to beat Hannah, Jonah begins noticing the spikes in Castiel’s head starting to fall out, and tries to alert Efram, to no avail. When Castiel breaks free from his chair and knocks Efram off Hannah, Jonah attempts to subdue him, but is stabbed and killed with an angel blade.

Appearances

 * Season 11
 * Out of the Darkness, Into the Fire 
 * Form and Void