Hunter Exam arc
Ryu first appears during the 287th Hunter Exam. Nothing is known about him, except that he is one of the 24 candidates who reached the 4th phase of the exam on Zevil Island. During the 4th phase he fights with Bodoro and is defeated, failing to pass this phase in the process.
Abilities & Powers
Not much is known about Ryu's fighting style. He is also seen always carrying a sword and can be speculated that he is a swordsman.