Soul Calibur III
"Yufeng" was a Halteese soldier. He fought under Halphas's command in chronicle 7 of the Chronicles of the Sword mode defending the giant defensive wall of Halteese. It was never revealed but possibly he or Kureha were brothers with Halphas and Demuth in the Halteese Royal Family.
Soul Calibur IV
Yufeng appears in Soulcalibur IV however with translation mistake from Soulcalibur III Yunfeng appears in tower of lost souls ascend mode under the floor "Uber Airhead" using Zasalamel's style and teamed up with Xianghua & Xunyu.