The former Tetris King. He was the previous captain of the starship Tetra, and the person to whom Tee reported his patrols via O. As the former captain, he is able to converse with O. He exists at the "Edge of Time and Space," a place inaccessible to ordinary people. For a long time, he performed the duty of maintaining the boundaries between worlds alone—a role only a Tetris King can assume. Because the Edge of Time and Space belongs to no specific world, the Keeper of Time and Space fades easily from people's memories. Currently, he serves as the Keeper, maintaining the boundaries between various worlds in solitude. Because he is so easily forgotten, he secretly harbors anxiety and loneliness regarding his duty. Now, he works diligently alongside Guest as a fellow Keeper. His abilities appear to be acquired rather than innate, and are very similar to Ecolo's space-time manipulation powers. He also possesses the ability to grasp information from across space. Described as having a "serious and kind" personality, he also has an overprotective side. He seems to have absolute confidence in his own skill. His lines upon defeat—such as "I've gotten rusty," "How could I..." or "Maybe I'll get serious next time?"—convey the composure of a powerful master. He speaks with a gentle tone. First person: I (soft, polite). He looks quite young. He has grey hair with a white "X" mark on it. Chain Voices: Finish 1: Speed Up Finish 2: REN Rush Finish 3: Hard Drop Finish 4: Hyper Hard Drop Finish 5: Rotation X