This one could be interesting… How about Akio and Tomoya?
Akio is an extremely capable athlete (He’s close to a professional capable baseball player, highly skilled at basketball, and an accomplished light… I mean, beam saber duelist and laser tag champion). He’s bigger and more broad-shouldered than Tomoya and lacks the obvious physical imparment.
On the flip side, while Akio is even more headstrong and stubborn than Tomoya, he’s lacking in raw endurance. Because he’s a chain smoker, I doubt he’d be able to say, put up with (Minor spoilers in Tomoya arc in Tomoyo After arc) That Tomoya did against the thugs he faced day after day . Akio is also a bit on the lazy side, often shirking his duties at the Furukawa Bakery to have fun. Granting, he DOES teach Little League Baseball some of that time, but considering that level, I don’t imagine that gives you a lot of exercise.
Now, despite the aforementioned injury, Tomoya is one of (if not THE) most determined people in the Clannad verse. (Clannad Yukine anime spoilers) Going toe to toe with the leader of a GANG for hours on end and fighting him TO A DRAW is no mean feat, especially considering (Tomoya arc spoilers) He didn’t even go through the training with Kanako here. He basically did it impromptu . He also seems to have a slightly better grasp of martial arts combat than Akio.
Which makes it a bit tough, but considering how wild and chaotic of a fighter he is, I might actually go with Akio here…