Hark
Hark is the main villain of The Hellish Cycle! Nobody really quite knows... what he is, exactly. He's certainly a resident of Hell, but he doesn't seem like a former human, neither Hellbound nor Heavenbound. Maybe he's a Fallen Angel; an unfathomably old & incomprehensible being that fell from the Heavens & somehow never reincarnated as a human. ...Though that seems unlikely.
In truth, Hark isn't any of those. Not really. He is the byproduct of a beacon left behind in Hell by the original Fallen Angels; a beacon of darkness that shrouded Hell in a dense, shadowy fog, causing it to become the cold & frigid wasteland it is today. Hark is a being manifested by that concentrated cold & darkness, and his desire is to spread the frost beyond Hell, dragging everyone, dead or alive, down into the frozen pits with him, eternally trapped in ice & misery.