Dragon Warrior

The Dragon Warrior is a legendary prodigy described in Mega Man ZX Shippuden as one who would know the secret behind the Dragon Scroll. By reading this scroll, the Dragon Warrior would be granted "limitless power" after achieving the highest level of Kung fu and Ninjutsu. It is later revealed that this "secret" was only to believe in oneself, and that such power was found within. Girouette Mega Merging with Model Z understood this simple logic and thus he created the Dragon Scroll, its reflective golden surface symbolizing this knowledge.

Grand Civil War
When Kusanagi Gekko and Laura Gekko died, the Izumo Council declared it was time to choose who will be the Dragon Warrior, the one who would bring peace to the galaxy and stop evil from extending to the future. A tournament was held in Yumegakure to determine which Shinobi would be given the title, and all of the Valley showed up to see who would be chosen, with Po declaring it as the "greatest day in kung fu history". But the choosing ceremony picked Paul Gekko; a young child the one, brought by the universe itself. Ryuka of the Tenro Clan was shocked that Paul Gekko is the chosen Dragon Warrior and considered it a threat to the Five Great Nations.