The son of Jô Hayabusa, Ryu was born into the Dragon Lineage legacy; as required, he would be trained from childhood to walk the path of a ninja, a way of life plagued with danger, pain and sorrow.
As a child Ryu learned many crucial survival skills under the guidance and watchful eye of Omitsu, the caretaker of the Hayabusa clan's children. Under Omitsu's care Ryu quickly befriended Kureha and the two became inseparable. Training intensified as he grew older, adapting to these difficulties, Ryu quickly excelled among his peers, becoming one of the clan's top students. His skill would earn him the right to bear the name Hayabusa as his own, mastering many ninja skills, to the delight of his father.
As Ryu grew into a strong young ninja, his best friend Kureha became a Shrine Maiden. Growing up, he befriended many other members of his clan, including the veteran who fought beside his father Genjiro, Kureha's younger sister Momiji (who later becomes Ryu's apprentice), and his uncle from his mother's side Murai, who left the clan under unknown circumstances to establish his own rogue ninja clan.
Ryu also finds himself in good terms with the Mugen Tenshin clan, especially with Ayane, Kasumi (who later becomes a runaway ninja) and their current leader, Hayate. This also expands the Hayabusa clan own relations, meaning they can count on the Mugen Tenshin members for help and the opposite.