Answer
Kao-chan is the affectionate nickname given to Kaori Sakamoto by her fans. The nickname is a combination of her first name, Kaori, and the Japanese suffix "-chan," which is commonly used to express endearment or affection. "Kao" is a shortened form of her name, and adding "-chan" creates a playful and endearing nickname that reflects the admiration and fondness that fans have for the figure skater.