I think any character could be played pretty defensively because of the Just Defense+Guard Cancel.
I used to think Jae Hoon was a good defensive character because of the guard point on his Shakka-Shuu and his Hien Zan + Break is real good, if your Hien Zan Break trades, you can still easily follow up with a Hou'ou Kyaku.
Lately I been playing Gato... man, this guy is like a wall almost if you play him right.