Mystogan

He is another one of the S-classed mages who puts everyone to sleep every time he comes to the guild mainly because he hates to be seen. Makarov is the only person who is left unaffected by his magic but it still makes him tired. Laxus states that he has seen his face as well. He has a bandit type mask covering the bottom half of his face and a cap covering the top with only a slit being shown between his eyes.