These are what we call the 'YMMV items.' Things that some people find in this work. We call them 'your mileage might vary' because not everyone sees these things in the same way. This starts discussions in the trope lists, a thing we don't want. Please use the discussion page if you'd like to discuss any of these items.
Hollywood Pudgy: A staple. Kosaku is referred to as a fat pig most of the time because he can't manage to keep his weight stable despite looking quite athletic and muscular. Another such example involves a rival boxer named Matsuzaka who's been struggling to keep his weight up to Kosaku's level in order to fight him again. During the match, Matsuzaka does look slightly pudgy, yet everyone refers to him as "a whale". Of course, boxers below heavyweight have to be in incredible shape in order to compete, given the strict limits on what they can weigh, to the point that seeing any visible fat on these guys would be taken as a sign of being in sub-optimal shape for the bout. Some stories about real life boxers who have struggled with weight and eating habits talk about these fighters gaining as much as 40 to 60 pounds, (approx. 18 to 27 kg) in between fights, and then having to burn all that off in training.