Jiang Cheng

Sandu translates as "three poisons." It's a Buddhist metaphor for the three roots of human suffering: greed, anger, and ignorance.
Peculiarities:
This is a straight sword.
In the story, Jiang Cheng temporarily handed it over to Wen Chao when he was held hostage by the Qishan Wen Sect, but later returned it.
He used Sandu to protect his sister Jiang Yanli during the Nightless City massacre.
During the Second Siege of the Barrows, Jiang Cheng fought with the sharp blade of Sandu
Zidian (紫电)
Zidian (Purple Lightning) is a family heirloom of the Yunmeng Jiang Sect that Jiang Cheng wears on the index finger of his right hand.
Peculiarities:
Its standard form is a ring with a purple crystal, but when swung, it transforms into a whip that emits purple lightning.
It has the ability to separate a person's soul and body if they are possessed by an evil spirit. This makes it a useful tool for detecting possession.
There is, however, an important exception: if the body was voluntarily offered to the spirit (as in the case of Mo Xuanyu and Wei Wuxian), then the separation will not work.
Zidian obeys only its owner or the one whom the owner has personally authorized to use it.

Facial features: Sharp, yet graceful.
The eyebrows are thin.
His eyes are almond-shaped. The novel emphasizes that his gaze is scorching, like lightning, and clearly conveys an intent to attack. In the animated adaptation (donghua), his eyes are depicted as a light gray, or steel-gray.
Hairstyle. In the animated version, her hair is pulled back into a bun, with the front strands loose and the sides braided. The hairstyle is usually held in place with a long purple ribbon.
Clothing: Jiang Cheng wears the purple robe (jianxiu) of the Yunmeng Jiang clan.
In adolescence, his facial features are softer, and his hairstyle is simpler - without braids.

From childhood, Jiang Cheng was overly proud and arrogant. His character was greatly influenced by his difficult relationship with his parents: his father and mother had an arranged marriage, and they were very different people, which affected his upbringing.
Jiang Cheng's deep inferiority complex stemmed from his belief that his father favored Wei Wuxian and that his mother constantly reminded him that his cultivation level was inferior to his brother's. These traumas largely shaped his behavior in adulthood.
After his sister's death, Jiang Cheng is consumed by vengeance and rage. He blames Wei Wuxian for Yanli's death and becomes his former brother's main adversary. As a result, Jiang Cheng gains a reputation as a merciless hunter of cultivators who follow the dark path.
However, behind the facade of aggression and arrogance lies a man who loves his family immensely and is willing to do anything to protect them. He genuinely cares for his loved ones, even if he appears cold and cruel on the outside.