I like that KenBindi sort of turns the nerd x athlete trope on its head, because yeah, Kenji is an amazing player, and is super charming with the press (I'm a media darling! Kenji truther above all else), but it's also canon that he doesn't really have any friends, other than Wakita. He's definitely been accustomed to keeping to himself since he was like 6/7.
Thandi on the other hand, is a bit socially awkward, and a little prickly towards those who bother them, but they warm up to people quickly, make friends pretty fast after moving to Japan, and are generally happy to hang out with others after work hours.