Jax the Original

He's much stronger than Jakku, and Jakku is the strongest character in my series, until now.
Jakku is the only one who sees/hears/etc. him, too.
This villain can even cast hexes and spells, he can erase your memory or make you sick with a snap of his figures or with a blink of an eye.

He generally target's Jakku, he gives him haunting nightmares everyday, he'll replay painful memories Jakku has and sometimes gives them a painful twists, or visions of a could be doomed future, or just makes Jakku fears feel like their actually happening. He even occasionally makes him ill, draws bad luck towards him, etc.

He can't interfere with anyone else though, at least not yet. Something is keeping this villain from wreaking havoc on the material world, and it's something that can break too.