Vital stats swiped from the first tankoubon:

Birthday:	March 3
Astrological Sign:	Pisces
Grade at start of series:	8th
Blood type:	A
Favorite food:	Spaghetti
Least favorite food:	sweet food
Favorite class:	English
Least favorite class:	Sewing half of home ec
Extracurriculars:	Fencing team
Hobbies:	Baking cakes
Specialties:	Understanding of English, fencing
Favorite color:	Blue
Carrer Hopes:	A housewife
Family:	Mother Father
Magic Element:	Water

<Alice> What do we have on Umi-san's dossier?
<Satsuki> Um... let's see. "She is not afraid
          of things and speaks her mind clearly, so she
          may be seen as a selfish person.  However,
          she cares deeply about all her friends.  She
          uses rapiers well due to her fencing
          experience."
<Asuka> She sure liked chasing Mokona around.
<ChunHyang> She's the one that almost always
            started the "Mokona looks like a
            marshmallow" thing.... and didn't she also
            say "Ice cream" when it came to Mokona
            and food?
<Satsuki> She chased Mokona a lot, yes.
          Especially when Mokona did something to put
          the girls in a weird / bad situation.
<Rei> ... Umi is the only one that ended the
      series with a love polygon.
<Shinji> Unless you cound Hikaru's polygon.
<Satsuki> that's kinda like spoilers, so no more,
          okay Children?
<Rei> Of course, we are here to work.
<Shinji> So where were we about Umi?
<ChunHyang> around the part where I was going to
            say that she was the very assertive one.
            She was very bitchy during a
            few occasions, especially in the beginning.
<Satsuki> That might be because she's an only
          child in a relatively rich family -- so she
          might have grown up a spoiled brat.
<Alice> But she is a very sweet person once you
        get to know her, once you penetrate through
        that icy barrier.  
<Satsuki> Exactly.  I think that's why people
          like her, because she is assertive, yet
          kind.
* Asuka flips through the first tankoubon.
<Asuka> My God!  She's almost a whole head
        taller than Hikaru!
<Shinji> Asuka, do you have something about
         heights?
<Asuka> Shut up!
<ChunHyang> Asuka, you're about as short-
            tempered as Umi is!
<Rei> I think more so than Umi.
<Asuka> I'm NOT short-
        tempered!
<Alice> The way you are acting right now, you
        are.  *smile*
<Asuka> (shrinking) oh.
<Rika> at least Asuka doesn't have any water
       spells.
<Asuka> If I was in Cephiro, I would be red
        because I'll be the leader, thankyouverymuch!
<Tomoyo> oh, but Water Dragon (mizu no
         ryuu) is pretty powerful.
<ChunHyang> I prefer Sapphire Waterspout
            (aoi tatsumaki) though....