Sayaka, also known as "Rokugō" (6号, "Rokugō"? meaning "#6"), is a good girl who often gets taken advantage of because of her kindness, although she doesn't seem to mind. Miyuki Igarashi of class 1-A gave her the nickname Rokugō because she was the sixth girl in the school to bear the name Suzuki, though this is never explicitly explained in the anime version. Sayaka's catch-phrase is saying that something is "-of the year", (for example, "teacher of the year"). In certain episodes, Becky refers to Rokugō as "over-sized" or "big ribbon" due to her hairstyle.

-wikipedia