Tet

Tet (テト Teto) is the Sole God of Disboard. After both Shiro and Sora defeated him   in a game of Internet chess, he summoned the siblings to Disboard, and asked them to save humanity. To challenge Tet, one must collect all pieces of different chess from 16 races, this means under the Ten Rules, one must win or unite all 16 races.

Personality
From his introduction when he transported Shiro and Sora to his world, Tet has been shown to be bright and playful like any human boy at his apparent age. From the rules he set up on Disboard he appears to abhor violence and fighting, probably after seeing what the ancient war did to the world. This shows that he may be somewhat benevolent and peaceful.