Fu is one of Ling Yao's bodyguards. He is an older man who is committed to his duties and is generally stern in nature. He is also the grandfather of Ling's other bodyguard, Lan Fan, who he cares very much for. Fu sometimes leaves his prince's side for an extended period of time to take care of his own business, but despite this Fu remains deeply loyal to his prince and is determined to bring Ling and the immortality he hopes to gain back to Xing.

Source: Wikipedia, myanimelist