This anime is taken from the light novel of Yomi Hirasaka, produced by AIC and directed by Hisashi Saitō.
Who is Sena Kashiwazaki?
The wealthy blonde daughter of the school's headteacher, Sena shows a dislike of all things "ordinary." She is both attractive and academically successful, but her resulting arrogance leads her to be disliked by her female peers.
Their admiration eludes her, much as she desires it; she treats her male classmates only as servants to be used, although many of them would like to be her boyfriend.
Nonetheless, she holds Kodaka to a higher standard. Kodaka concludes that she is the weirdest member of the club, as she is able to warrant weird and disgusted looks not only from Yozora and Kobato, but also from Yukimura and Rika.
She enjoys playing video games, including dating sims and eroge, partially because they allow her to make female (if virtual) friends.
She is generally fascinated by the girls in these games and has also taken a liking to Kobato.
Yozora calls her "Meat" (due to her large breasts), an insulting nickname which she secretly likes because it was the first she had ever received. It also seems that she also developed some feelings for Kodaka after several events.
In Volume 7 of the Light Novel, it was revealed that Kodaka and Sena are fiancés betrothed by their father's which she fully accepts.
In Volume 8, Sena proposes to Kodaka, asking him to marry her. Sena also confesses to Kodaka that she loves him.
About the Sena Kashiwazaki Figure by J-list:
Everyone drop what you're doing -- the best figure from the hit anime and manga I Have Few Friends (aka Boku wa Tomodachi ga Sukunai, aka Haganai) is here. This is a 1:7 scale figure of Sena Kashiwazaki, the grumpy but oh-so-touchable rich girl who has a butterfly in her hair. The detail is like nothing we've seen, and everything about her is gorgeous done -- her hair, her face and eyes, the tartan check pattern on her skirt, and more.
If you are interested about Sena 1/7 Figure, go to the link to buy it: