Urek Mazino (우렉 마지노, "Urek Majino") is an Irregular, currently 4th in Rank. He is the strongest active Ranker and also the most recent to be part of the Top 5 High Rankers inside the Tower. He is considered to be on the same level as Phantaminum by weaker Rankers, however, his true rank is almost impossible to determine in terms of the Top 4 ranks, because the other three Rankers are inactive and thus cannot be compared with Urek. He mentioned to Baam on the 43rd Floor that they would meet again later on the 77th Floor, then left the floor. His current location is unknown.