Sato is a second class realitant from Japan in reality prime. He, along with Tick, Paul, and Sofia, was recruited to the realitants by letter. Sato's Alternate was leader of the Fifth Reality, and was assassinated. Sato later becomes the Fifth Reality leader.
Sato is very quiet and reserved, and he seems to be not very trusting at first.
Rude, secretive, untrusting