Well first off when I see the game I would just play this game strictly for fun. As the learning curve while it doesn't look steep finding the team synergy would be a pain in the butt. Judging from what I've seen and that isn't much. Seems everyone is afraid to use Tekken characters. Well to take the best of both worlds from what I know. Why not Abel and Hworang?
Starting with Hworang. While's he's no Baek Doo San. At least Baek taught this guy how to fight so the guy has something going for him. From what I remember about the Tae Kwon Do student he does have some nice and easy launchers back there in Tekken. Along with some easy combos. And he does have my favorite move "Hunting Hawk" I believe its called. Where he kicks you in the air twice and the 3rd kick knocks you down. While looking cool with that he obviously has some easy synergy so why not go to the other character.
Abel...also known as the untapped potential in my book when SF4 was released (next to Twins 2.0 AKA Rufus). Dude has some impressive throws and easy chains (or rekkas...rekkas being move 1, move 2, move 3, etc. in a simple chain). This guy is just scary to face especially online with an easy anti-air and easy command throws. I loved using this guy back in SF4. Even if throws are now lowered in priority he's still a good character. Not to mention his easy chain specials and a dodge roll as I would call it. No doubt this guy can be a good partner for Hworang and vice versa.