Her birthday is January 11, AC176. This makes her 21 in AC197. I selected this date for a lot of reasons. Primarily, I selected it because of 1/11. She's one now but she used to be two ones side by side due to the whole split personality situation. There are three facets to her. That's shown in this date. We have three ones. Three selves. One of those selves stands apart from the other two and is bigger than them. One of those selves actually consists of an amalgamation of the other two. This also makes her a Capricorn. The Capricorn MS has a serial number of OZ-11MS which is another reason I deemed this a good fit.
Her favorite color's a toss-up between green and purple. Green's obviously for Preventer. Purple's a bit more complicated. This is the last color we see her wearing in animated canon. It's also the color you get when you blend red (her OZ uniform) and blue (her diplomatic attire) together. Furthermore, she wears purple on a visit to Treize's grave meaning she likely picked the outfit herself as opposed to the pink she wears to the X-mas party or the blue she wears as a diplomat which likely may have been selected by a stylist.
Despite the eyeglasses from before, she actually has 20/20 vision. She only wore them to cultivate a stern image. This shows in how she isn't exactly bumbling when she doesn't have them on.
She's right-handed.
Personal appearance is actually a big deal to her but not out of vanity. She knows that having physical appeal has certain advantages and she's not above making good use of it. If someone ever ruined her face, she'd be horrified not because of tarnished beauty but because she would no longer be able to perform her duties as well as she used to. You need a pretty face when in front of clients, investors and the press.
Her favorite movie is probably On The Town, a 1949 musical. GW diverges from the real world around 1956. It's a musical comedy about sailors on shore leave. She mostly just watches it for Frank Sinatra while musing on the ridiculousness of what the military used to be like back then. It's also a romantic comedy where everyone finds someone but they end up having to part ways not really knowing if they'll ever see each other again. Bittersweet things like that tend to appeal to her.
If you ask her what her favorite book is, she'd probably say she enjoys Greek mythology particularly the myth of Orpheus and Eurydice as well as Pygmalion and Galatea. She also reads Franz Kafka. She's just being snooty. 8| She enjoys reading a lot of myth but she also indulges in trashy romance novels quite a bit.
She enjoys listening to a lot of standard songs from the fifties to sixties. Sinatra and the like. "Fly Me to the Moon" is one of her favorite songs. During the Gardentasta, she actually danced to "Witchcraft" with Basch and recognized "Moon River" when it started playing.
She sleeps late and gets up super early so I pity anyone who has to deliver the morning paper to her suite.
Tying a knot in cherry stem with your tongue? Yep, she can pull that off. Not a skill she's exactly shown anyone though. She pretty much honed it while toying with the cherries in her virgin cocktails/mocktails during dull political dinner parties. It's not ladylike but even she gets bored and no one really noticed since most of the other politicians were probably drunk off their faces.
Back home, she's rejected quite a few marriage proposals. I actually have this as game canon in a log with Noin.
Having strangers touch her is not a big deal. One of her soldiers picks her up after she fails to stop the getaway vehicle containing Relena in Episode 5. In Episode 17, we see one of her soldiers braiding her hair. In Episode 18, we see maids undressing her. The one time she's uncomfortable about being touched is in Episode 11 when Treize takes her hand. Her gloved hand visibly shakes while he's holding it.
After Treize's death, Une maintained his list of names belonging to the dead.
On her birthday, she buys herself a present to be opened a year later. Basically, she's buying a birthday present for her future self who's a year older.
She takes her coffee black (light roasted beans) with sugar. She usually takes her tea with lemon.