Ryouga is a boy from "The Village of Protecting Time." He is training to become stronger so the mysterious being "Arcades" will take him to where his father is.
Ryouga has superhuman strength. He is able to carry incredibly heavy items with relative ease and is skilled at hand-to-hand combat. These abilities may have something to do with the fact that he can transform into a half human, half Zekrom like creature by doing something called "Burst." When in this state, Ryouga's strength shoots up even more.
Ryouga hates phrases like "that's impossible!" and "you can't!" Whenever he hears someone utter one of these, he becomes even more determined than ever to prove that person wrong. According to his mother, Ryouga's been this way for a long time.
Ryouga first appears in Volume One, Chapter One.
(Source: dogasu.bulbagarden.net)