Occupation: high school student
Birthday: November 27th (Saggitarius)
Age: 16-17?
Powers: unknown

She's Watanuki's classmate and some sort of friend. And he has a crush on her, of course, so that makes her the love interest. We know virtually nothing about her, except for a couple of things: she buys her lunch and doesn't cook, has looked at Doumeki in a dreamy sort of way, digs astrology and horoscopes and ghost stories, can see Mokona and likes weird things (oh yeah? stick around then, you'll have a blast!).

There's something strange about Himawari, though. Yuuko seems to know what's with her, but she hasn't told anyone yet (blame it on the beer). The fandom (included myself) tend to assume she has some sort of powers, and they don't seem too positive so far... We never know with CLAMP.