Z'algatoth

Z'algatoth, sometimes referred to his perceived nickname as Zalgo, is one of the main antagonists of the Stardust comic. On the multiverse of Modern Age Earths, Zalgo is known merely as a viral Internet phenomenon and a fictional Creepypasta character portrayed as an entity believed to cause insanity, death and destruction of the worlds at the End Times. However, he does exist and is actually the cosmic entity representing the concept of insanity rather than an active interuniversal killer.

Zalgo has a counterpart, Galona, the entity of sanity and mental health, who also happens to be his sister.