Gorse

A undead brat who was once a powerful semi-immortal Dream and does everything (evil stuff) to get back his lost mightiness.

He's the worst Dream :) but also the most powerful (when he was one haha loose your powers you unworthy idiot)

Gave nightmares to everyone in existence when he could, now as a zombie, he just kills all Dreams who aren't him because only him is allowed to be one according to him, and he wants the parasite to get back to his face :)