Kei Karuizawa

Kei Karuizawa is among the students with excellent grades in class 1-D.

She is situated in the second row, second seat from the left, next to her "boyfriend", Yōsuke Hirata.

Background
Despite her prominent figure in class and her constantly outgoing personality on the surface, she used to have a harsh past. When she was a middle schooler, she was the central victim of multiple bully incidents. This has left her with a scar and an emotional trauma that continue to haunt her.

Appearance
Kei is a teenage girl of average height with purple eyes and long blonde hair. While so, her hair is tied in a ponytail while the rest of it extends to her back.

In her school uniform, she wears a light blue dress shirt below the red school blazer with rolled-up sleeves and a short white skirt. She walks in standard school shoes with light blue calf length socks. She also wears a blue ribbon around her collar. In a more casual clothing set, she simply wraps her school blazer around her waist and rolls up her dress shirt sleeves.

Personality
Kei is an outgoing person, spending most of her time with the girls at school and Yōsuke Hirata, her "boyfriend". She is also someone who speaks for the girls in the class, acting as one of the leaders along with Yōsuke and eventually Suzune Horikita.

She seems to be a bit of a mooch, as after spending all her points from the first month and Class D not receiving any due to their actions, asked the girls of her class to lend her some money to buy the 'essentials', managing to get at least 2000 points from Kikyō Kushida

Plot
In the anime, Kei Karuizawa, like the other first years, listened to the speech given by Manabu Horikita welcoming the first years to their new school. She was seen in the class talking to Satsuki Shinohara before Yōsuke Hirata asked the class to introduce themselves, agreeing with the idea.

After Sae Chabashira had walked in and introduced to the class the system in which they are supposed to live in now, Kei was surprised at the fact that they received 100,000 points to begin with. She was seen talking with Maya Satō and Chiaki Matsushita about clothes and jewellery shopping after the classes that day. At the start of the new month of May, along with the rest of D-Class, Kei was surprised why they didn't receive the monthly allotment of points, looking depressed throughout the explanation of S-Points and how D-Class failed to keep any of their points.

Some days later, Kei was seen having fun the pool with her classmates, especially getting close to Yōsuke. She tried Kikyō to lend her points along with some other girls of the class to buy the 'essentials', in which at least Kikyō complied with the demand. She is seen getting closer to Yosuke (although whether they were dating at this point exactly is unknown) then proceeding to take the mid-test exams and passed with an overall score of 75.

Trivia

 * She has a character issue, one of the defects that are attributed to her being in class D.