personally, I think the seme/uke interaction is both about personality and body type. but ...

personally, I think the seme/uke interaction is both about personality and body type. but i really don't see a sadist like yuuichirou being uke, so i think in his case it's more about personality. same with micchan. he was blushing soooo much, he was sooo cute that i felt my inner sadist seme coming out lol