Neron

Neron is a demon who is hunting John Constantine.

Biography
At some point, Neron acquired the deed to John Constantine's soul.

Sometime after, Neron came after John to get his help in usurping the triumvirate ruling Hell. When John refused to help him, Neron began hunting him. However, he soon made a deal with John's boyfriend, Desmond, to bind his soul with him in exchange for sparing John's life. The deal was later made public to John when in an attempt to send Neron to Hell, he had sent Dez there as well.

A few months later, Neron was playing golf with Hank Heywood while taking Desmond's form. He was also present in Hank's Hemophilia fundraiser ball a few days after that. Soon after, Neron got an alert that someone was changing Hank's password from inside the Time Bureau and called Hank to tell him about it while going into Hank's office and looking into it. When Hank returned to his office a few hours later, Neron was waiting there for him. After Hank asked him to part ways, as Hank had a change of heart after spending some time with his son, Neron killed Hank after telling the latter he was no longer needed, disappearing just in time to make Nora Darhk take to fall for the murder.

Powers

 * Demonic physiology: Neron is a powerful demon from Hell, whom John Constantine feared. His power is so great that even Fairy Godmother is more terrified of facing him than facing Hell.
 * Shapeshifting: Neron is able to take Desmond's form and shapeshift his body parts into his original look. Neron could also take John's form while talking to him.
 * Dark Magic: Neron as a demonic being has vast amounts of dark magic at his disposal. Nora Darhk could sense his powers while being close to him.
 * Life-Force Absorption: Neron used his powers to absorb the life force out of Hank, killing him.
 * Reflection spell: Like Nora Darhk, Neron knew the spell and used it to communicate with John.
 * Bond with Desmond: Desmond bound his soul to Neron's exchange for Neron sparing John Constantine's life.

Abilities

 * Intimidation: John Constantine is terrified of Neron to the point of nearly "breaking" the timeline just to avoid facing him. Fairy Godmother declares that she would rather face Hell than "piss off" Neron. Hank Heywood was also terrified of disappointing him.

DC's Legends of Tomorrow
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Season 4
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Behind the scenes

 * In the main DC Comics continuity Neron is the Demon Lord of Hell, who has managed to gather enough souls to become the Devil, and was first seen during the Underworld Unleashed storyline, where he made deals with superheroes and supervillains alike.