Not much is known about the Mystery Slav besides that he tried to help Scruh and Jearmy defeat Edgy Sean. After being immediately parried and exploded, Mystery Slav fell to the ground and disappeared. He appears in a QnA with Jearmy, but it is speculated that isn't the real Mystery Slav, and that the true one is hiding out somewhere, training to become even stronger. Mystery Slav usually only comes out in the winter, as his tracksuit and fluffy hat give him very nice warmth.