She is the queen of the snakemen. She is currently a Dou Di and also exists in the form of a snake. she is a nine coloured heavenly python.
She is intrested in Xiao Yan, but want to kill him for many reasons. One of those being that she is prideful and arrogant of the fact that she is Queen Medusa, while Xiao Yan doesn´t seem to care all the time.
Medusa is a very beautiful snake woman. She gains a younger appearance (roughly 13-14 yr old) after trying to advance into higher ranks which Yun Shan mistakes her as her daughter. She has long crimson colored hair, pale snow white skin and golden colored eyes. She normally wears a purpled skin tight dress.
She is very prideful and has superiority complex as she wanted other people to address her as "Your Highness" or "Queen". Medusa has a soft point towards children and admitted that humans are interesting.
She was accompanying with Xiao Yan because he can make a pill that would merge her soul with Xiao Cai allowing her complete control of her body.
She can't hurt Xiao Yan because of Xiao Cai's spirit. After The Falling Heart Flame arc she becomes pregnant with Xiao Yans child. She became one of the key members of the Yan Alliance and helped managed it in Xiao Yan's absence. They get married later on the series in chapter 1390.
She later on meets a hidden tribe of 7-coloured Heaven Swallowing Python which helps her improve her strength.
- She has a daughter with Xiao Yan. She named her Xiao Xiao. Little Cai (the 7-colored heaven swallowing snake who used to share a body with Medusa) was reincarnated used Xiao Xiao's body, allowing the latter to use its strength.
- In the light novel (chapter 517), she is the second person to see Yao Lao in his spirit form (the first being Xiao Yan).
- In the light novel (chapter 648), Xiao Yan gives her the name "Cai Lin".
- She houses the Ancient Souls of the 7-Colored Heaven Swallowing Python Tribe within her and can control them to fight with her. They currently have damaged souls and she intends to heal them if she has the opportunity. Chapter-1547