cyou_shigen
An original character by Beifeng Han.
The artist has also called her Zoeng Zijyun, the Cantonese pronunciation of her name.
She has long blonde_hair, and red_eyes. She is Miyaura Sanshio's friend.
For her Self-Introduction, her profile says:
Original:
はじめまして、張子源です！
14歲です
源ちゃんは三汐の友たちです~
Translation:
Nice to meet you, I'm Cyou Shigen!
I'm 14 years old.
Gen-chan is Shanshio's friend!
Translation credits: Moonspeaker