Nick

Nick is a briefly seen character in season five's pilot episode "Sympathy for the Devil". At the end of the episode, he agrees to become Lucifer's temporary vessel to bring justice for his late wife and daughter after Lucifer shows him several traumatic hallucinations of his family. He is assumed dead.

History
Nick's wife and child were murdered during a home invasion recently, and his grief often leads him to be at bars drinking. One night, when he comes home, he notices that there is something strange going on in his yard, a with strange wind and a moving door.

At night, he wakes up finding blood all over his bed, but when he turns on the lights, he realizes that he was hallucinating and tells himself to calm down. However, when he lays down again, he sees his late wife Sarah bloody beside him, telling him that he is special, chosen. Again, he closes and opens his eyes to see her gone, with a shocked expression on his face. Unable to sleep, he goes to pack down the toys that belonged to his dead daughter, but notices that the baby-monitor still works, and finds the crib flowing over blood. Unable to bear it all, Nick falls down, crying while seeing that it is another hallucination.

Once again trying to sleep, Nick is awakened by Sarah's voice, and finds her standing before him. She, however, tells him that she is not Sara, but Lucifer having taking a hallucinating form of her to be seen by Nick. Although Nick does not believe what he is told, Lucifer tells him that he was punished for loving God too much, and that Nick himself was punished wrongly by God by allowing Sarah and their child to die. The Devil asks Nick for help, telling him that he needs a vessel to walk the earth so that he can help him punish God. Hopeful, Nick asks Lucifer if he can revive his family if he agrees, but Lucifer can only do the next best: Punishing God. Beforehand, he tells Nick that the possession will be painful, but that he will help him get justice for his family. Nick then assents to possession.

Later in "Free to Be You and Me", Lucifer tells Sam that Nick is not really his vessel, but only a temporary one, a "plan B", and can barely host Lucifer without spontaneously combusting. As shown from "Abandon All Hope..." and forward, this proves to be true, as his body is getting worse and worse. When Castiel asks Lucifer why this is, he replies that Nick is "wearing thin", and it is shown that his body has taken on a sickly yellow pallor and the skin on his temples is gradually pealing away.

In "Two Minutes to Midnight, Castiel reveals the reason Nick has not died yet: Lucifer is forcing Nick to drink literally gallons of demon blood, which is said to strengthen Angelic vessels and keep them from exploding.

In "Swan Song", the deterioration of Nick's body has accelerated, and his face now bears many burns. When Lucifer moves to Sam after the latter gives him permission, Nick's body falls down, not moving. It is assumed that he either died at some point hosting Lucifer, or Lucifer, like his fellow archangel Raphael, left him completely brain-dead.

Season 5

 * "Sympathy for the Devil"
 * "Free to Be You and Me" (possessed by Lucifer)
 * "Abandon All Hope..." (possessed by Lucifer)
 * "Hammer of the Gods" (possessed by Lucifer)
 * "Swan Song" (possessed by Lucifer)

Family
Sarah was Nick's beloved wife, but was killed during a home invasion not too long before the fifth season's pilot episode. Lucifer uses Sarah's appearance in order to entice Nick into agreeing to be his vessel. Through Lucifer, she was portrayed by Bellamy Young.

Together with Sarah, Nick had a child who remains unnamed. Along with Sarah, the child was killed during a home invasion. Lucifer uses the child's crying voice to lure Nick into saying 'yes'.