One of my favorite little details about Michiru that’s exclusive the manga is her minor obsession with lipstick. It’s so important to her that she even lost her poise (something that’s EXTREMELY rare for her) just because Yaten insulted her color choice! XD
I also love Setsuna’s hurriedness in the first panel. In my head, Setsuna is EXTREMELY punctual due to being the soldier/guardian of time. Being on time is super important to her and one of her biggest pet peeves is being late.