Sena Kashiwazaki is a prominent character in the anime series 'Boku wa Tomodachi ga Sukunai', also known as 'Haganai'. She is portrayed as a beautiful and intelligent girl with long blonde hair and blue eyes. Despite her popularity and academic success, Sena struggles with making genuine friends due to her arrogant and self-centered demeanor. She joins the Neighbor's Club, a group formed to help its members make friends, where she often clashes with fellow member Yozora Mikazuki. Her character development revolves around her journey to understand friendship and improve her social skills.