Don't take it the wrong way. But seeing how the next arc takes place 7 years and 19 days, who among the main cast is mostly like to put on a few pounds during the passing years?
#Will there be at least one character who has gained weight in the 7 years (and 19 days)?
obsidian scroll
potent maple
???
nova ore
this is an interesting question, but i think op just meant that people tend to gain weight with age and it would be cool to see representation of that. which, i agree! though im not sure which of the characters would be gaining this weight, since most of them are warriors and fighters.