Tried him and did very well. Played him like a tank, slow and to the point. Heavy use of pokes and bloke strings (even got a message from someone complimenting my poking lol). Surprisingly effective style.
Experimented with parry, he can parry fireballs up two hits fine but not after it looks like. I was able to parry Robert's Ex fireball but not Athena's.
I was also able to parry K's dp+C on his wakeup no prob.
His dp+A a is really fast, was able to punish Iori's qcb+B on block. It doesn't seem fast enough to punish Kyo's qcf+K on block, or punish it after 1 hit. If you do dp+A in between his kicks there is an exchange, if you do dp+C then Ryo hits Kyo clean. Haven't tried sticking a parry there instead of a dp yet.
This guy can really dish out the damage too, sC, hcb+BD, dp+C (1 hit) [DC] into HCB+D, DP+C does almost 50% damage. All for just one power bar and drive.