Oh, this will be fun! Great idea!
I would be Sonia Ravynnrose. I am in Slytherin. I have long, very thick, lush black hair falling to my mid-back. My eyes are a vibrant copper, accentuated with intense brows, high cheekbones, a slender nose and full lips. I am tall for my age, and slim, but strong. I am quiet and very aloof, but not afraid to stand my ground. I don't seek trouble and don't pick on people, but I can be blunt and snarky if addressed, and am viewed as intimidating or unapproachable by most of my classmates, but also highly respected. If you are lucky enough to become close to me, you will, however, know that I'm really very shy and timid. I don't have a boyfriend (Though I drool on Snape and thrive on his detentions, of which I don't get a lot, being Slytherin) because I don't allow anyone to get to know me, but I'd like to think a few Slytherins secretly admire me for my mysterious flair. Inwardly, I am a very sensitive and empathetic person, and I also strive for accuracy and routine in my life, making me a perfectionist. I would probably have only one companion, and we would have a very close and inseparable friendship.
My wand would be made of ash. Ash represents sacrifice, sensitivity and higher awareness. I have an affinity with this type of tree and I think the symbolism fits with me well. However, using a Celtic calendar, as JKR did to assign wand woods, I would really have Ivy... but since my character is fictional and obviously not me, we'll say she was born in mid-Feb to mid-Mar, yes? Anyway, Dragon heartstring would be the core. It would be 12" and very swishy, pliable. Patronus is a panther.
Her birthday is February 21st, since Alan Rickman's birthday so beautifully fell into the required boundaries! :D This makes her a Pisces, and numerologically a 2. These sites describe the way these facts influence her personality perfectly:
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O.W.L. Examination
(E) Ancient Runes - Exceeds Expectations
(A) Apparition - Acceptable
(T) Arithmancy - Troll
(A) Astronomy - Acceptable
(O) Care of Magical Creatures - Outstanding
(E) Charms - Exceeds Expectations
(O) Defense Against the Dark Arts - Outstanding
(O) Divination - Outstanding
(P) Herbology - Poor
(A) History of Magic - Acceptable
(P) Flying - Poor
(A) Muggle Studies - Acceptable
(D) Potions - Dreadful
(A) Transfiguration - Acceptable