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As the son of Joe Hayabusa (Ken Hayabusa in the NES Ninja Gaiden[2]), "the ultimate ninja"[3] Ryu is an heir to the Dragon lineage and is the holder of the legendary Dragon Sword.[4] Although his father should have carried the sword, he passed the sword to Ryu early, due to his bravery and valor. His mother was not mentioned nor seen in any Ninja Gaiden games, although she was mentioned in the Worlds of Power novel where she gives Ryu the letter from his father. Ryu is 21 years old in Ninja Gaiden and two years older in the Dead or Alive series. Although he appears as a normal man, he is not completely human; because his ancestors draw their blood from the same Deities as the Fiends and Vigoor, he is susceptible to the Blood Curse and therefore is able to be turned into a Fiend.