1st year High School (U.S. 10th grade)
Mid-ranked schoolgirl headed for college. An average girl, she wasn't much of an outstanding student, but now she belongs to the chemistry club. Even as an average middle school girl {Middle school is three years) she could already face up to Ougigaya (her senpai). She blends easily into the normal surroundings of regular girls. Represents the chemistry department in the Mega Fight Tournament. She undergoes Ougigaya's intensive training in order to understand the secret techniques of the chemistry department.
1st year High School (U.S. 10th Grade)
Went to a different middle school than Asuka, but during kindergarten and elementary school they were always in the same class. Because she is isolated in a school where students seem to stand at a slant, Karina stood out.
2nd year High School (U.S. 11th Grade)
She became fairly disinterested with being raised in an affluent family of dance tradtions. She doesn't dislike socializing, but because she is so formal she keeps a distance. She is well-liked by the senior citizens, and people like Genichirou Shindou (the principal) often join her for tea.
1st year High School (U.S. Grade 10)
Quiet except in club activities; doesn't stand out. She almost never boasts. She met Asuka at the Ryouran entrance exam; Ever since Mega Fight, they've become close friends. The threesome of Kumi, Asuka, and Karina plan to become close-knit friends.