When Harald Siepermann worked on Walt Disney’s Mulan, he also contributed visual development for the characters Yao, Ling, and Chien-Po, three soldiers that befriends Mulan, which during that time of production was also called the Three Soldiers or the Gang of Three.
Harald Siepermann worked on and off on these characters in April and May 1995 during his stay at the Walt Disney studio in Burbank. His reference for these characters were the designs of Chen-Yi Chang, that had already established the significant different shapes of postures for each character.
Below are some designs that seems to be channelled after the character Yao:
… and Ling:
… and below are designs that resemble Chien-Po:
While Harald Siepermann’s designs might have been inspiring during the creative process of these characters, the final design for Yao was done by Supervising Animator Aaron Blaise, and for Ling and Chien-Po by Supervising Animator Broose Johnson.