Akiyama. For all the reasons said by Grissefar below. He does have my favorite fighting style too though because I love kick heavy characters in all games. For instance, Hwoarang is my favorite Tekken character.

Not in terms of fighting style but just in terms of character.

I like Akiyama best, for his laid back attitude which is in strong contrast to Hana, and I think the story could have used some more of him. The only thing I don't get is, slight spoilers I guess, how he got the 100 billion yen, seriously what the fuck? He owns a not-toptier hostess club in harsh times and has only had a few years to earn them.

Akiyama so far. I have a feeling though, I'll enjoy Kiryu the most when I get to him. I'm not sure if I like Tanimura. Kind of sleazy. I also think Akiyama has the best fighting style. Saejima is too bulky for my tastes, and Tanimura does some weird stuff, mainly the throwing mechanics.

Akiyama

I liked Tanimura alot, cuffing guys, great grapple moves. Also the animation, i remember thinking it was a nice touch that he almost trips himself when he do the backward kick after grabbing an enemy.

Oh and his final battle is pretty great too.