Ryou is the brilliant yet sensitive character one of the three. He was the head of the Kubere's Project Achilles to create Gawl. He feels a heavy remorse and guilt over his experiments on Gawl. 

Ryo, Gawl and Koji are 3 young boys who travel back into the past with only 1 objective: change history. In their time they discover that their country, Kubere, uses genetically enhanced persons called generators as a military tool. These generators are the cause for the Third War which kills most of the human population. Now Koji, Ryo and Gawl are there to change all the events.
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(Source: Anime News Network)

Ryou Tanaka