Kimiko has a pair of grey eyes with short brown hair. She is usually seen wearing the Ouran Academy's high school girls' uniform and only seen wearing a different outfit on several occasions such as when the Host Club went to the beach, where she wears a black two-piece bikini outfit.
She and Momoka Kurakano are best friends and, along with Renge, make up Haruhi's most devoted customers. She and Momoka have been in the same class since grade school and her family owns a botanical park, as seen in Chapter 70 of the manga.
Kimiko has O-type blood, which is thought to make people more agreeable. She is said to get along with everyone, as she has no prejudices. This is demonstrated when she tells Haruhi she looks beautiful cross-dressing in girl's clothes, and later when she easily accepts that Haruhi is, in fact, a girl.
Kimiko Sakurazuka actually appeared in Ep 01 - Starting Today, You are a Host! and appears almost every single time a Host Club meeting is shown in progress in Music Room #3 . Bisco Hatori said she always wanted to write a chapter starring Kimiko and Momoka, but never got around to it.
Momoka and Kimiko are best friends and are Haruhi's best customers. Kimiko is almost always shown with Momoka. The two win a special date with one Host Club member and, naturally, they choose Haruhi. By the conclusion of the manga, they are shown to be very accepting of Haruhi's cross-dressing, not knowing that she is really actually a girl as shown in the final chapter. Still, Haruhi is touched by their final messages to her.