That Man, also referred to as the Gear Maker, is a major character in the Guilty Gear series. He is the creator of the Gears and Justice, and the target of Sol Badguy's revenge. He has three servants: Raven, I-No, and Jack-O' Valentine, who frequently act on his behalf while he remains behind the scenes.

He stands at the pinnacle even among the company of generally highly capable magic wielders. He is both a scientist and also unparalleled in his mastery of magic - what one would call a genius. Although he is generally polite and humble, he often finds even his carefully considered statements can result in discord.

In contrast to his intellectual capabilities, he severely lacks in stamina, with the slightest exercise tiring him out. Any physically straining tasks are handled by custom-made-bits of his. Asuka continues to transmit "clear numbers" from space, in the hopes of bringing peace to Earth.