He has greater powers then his younger cousin Mr. Mxyzptlk, but he is the black sheep of the family. He had spent time at the Gooloogog mental institute on Zrfff.
Note: to 3rd dimensioners like us, Nzykmulk looks a lot like his cousin Mr. Mxyzptlk, but if you were a 5th dimensional being, you’d see the differences. Actually, he has a mole on the right side of his cheek.