Suzuki Kuan-Xi first joined the party as an NPC, because she had a mission to make Anto famous.
She's a member of the Song of the Phoenix, and she's the triad member from the House of Melody. (Song Min Feng is the triad member from the House of Silence and Yanyu is the triad member from the House of Harmony.) In addition, she is a princess of the Shrouded Isle, by virtue of being the daughter of the Lord and Lady of one of the three Great Houses of the Isle.
She also has a fabulous little carriage.
After Kuan-Xi was kidnapped by the Whale Spirit Yanyu learned a shtick for locating the other members of the triad and had regularly been reporting on Kuan-Xi's whereabouts to the party. Check out Where in the World is Suzuki Kuan-Xi.
After being taken to task for not being serious by her revered ancestor Ho Tan Mi, the Prince of the Golden Palace, Kuan-Xi decided to become a PC. She took up water sorcery, studying with Shen Gao in the Dragon's Throne.
A Grand Ritual was done on Kuan-Xi by Autumn Rose after Kuan-Xi dealt the killing blow to her father, the Cartogramancer. This severed her from her Suzuki family.
So now she is Ho Kuan-Xi, Princess of the Northern Seas, Receiver of Petitions of the Golden Palace, the Mystery Shopper, Binder of the Unbinder.
A couple of reference pages: