[He frowns again, focusing more intently on him. Natsumi's observations are correct, of course, but they're only the surface details.]

Whatever he has in his coat is mostly along the right-hand size. The hem is just a little lower. That probably means he's left-handed, since it's easier to reach into your jacket with the opposite hand.

He's also wearing a surgical mask. It's more likely that he's buttoned up his coat because he feels cold from illness.

[--What a boring answer. Is it the world that's boring, or him???]