Will there be different reactions on the weight gain based on how they gain weight.For example if there would be a male partner having problems that their weight gain is more focused on the breast area and so they would feel that weight made them look more feminine and wont like it,the bratty type can say something like this or a trans man can feel uncomfortable with bigger breasts.
Would you tie them to personalities/body types or something else? Granted that most gay """classes""" differ based on muscle mass, body fat and bodyhair, maybe making Muscle (separate from fitness) and bodyhair an actual variable that can be represented in the texts and sprites would work? Makes sense since trans characters are coming too!