Yue Gao

She is quite cheerful, playful and generous, as well as kind and innocent. She often getting along easy with almost everyone. She and Tianming are good friends, and she treats Duanmu Rong as her sister, often referring her as "Sister Rong". She is extremely bright and intelligent and can analyse things very accurately. She solved many mysteries in the forbidden ground when nobody else knew the answer. She seems to have powers in seeing stars and a complicated relationship with the Moon Goddess.

It is stated that she is an orphan, but little is known about her. Flashback shots in Seasons 1 and 2 suggest her Yan royal origin. The plot development allows to suggest that she is either a small sister or daughter of Dan, the Crown Prince of Yan (historically Dan has never become the king, but was indeed involved in sending Jing Ke to Qin in order to murder the First Emperor).

https://myanimelist.net/character/108731/Yue_Gao https://bangumi.tv/character/20801