LanXichen

Given that he was still a junior at the start of the Sunshot Campaign, Lan Xichen was less than three years older than his younger brother Lan Wangji. Together, the two of them were known as the Twin Jades of Lan.

Tall and slender, Lan Xichen bore a strong resemblance to his younger brother. There were two major differences between them: first, that Lan Xichen's eyes were gentler and darker than Lan Wangji's, and second, that Lan Xichen's face usually bore a smile, while Lan Wangji remained stoic.

He wore the white robes and hair ribbon of the Gusu Lan Sect, with Liebing and Shuoyue hanging at his waist.

Lan Xichen had kind and gentle personality. He tended to wear a smile on his face, and was polite to everyone he met. In contrast to many in their cultivation society, Lan Xichen treated everyone with the same courtesy regardless of status. For instance, he gladly accepted the tea Jin Guangyao offered him when others refused to accept anything from the son of a prostitute.

Slow to anger, Lan Xichen was only provoked if the situation involved someone he loved, such as when he became angry at the thought that Wei Wuxian had deliberately mocked Lan Wangji's feelings.

He likewise tended to believe the best in others, to the extent that he admitted he did not wish to learn why his mother had killed someone, and, despite losing trust in his younger sworn brother, insisted on listening to Jin Guangyao's reasons. Overall, he seemed to believe that most people acted with good intentions despite their actions.

Lan Xichen ranked first on the list of best-looking young men in the cultivational world.
As part of the Lan family genetics, Lan Xichen also becomes drunk with merely one cup of wine. According to the author, when Lan Xichen gets drunk, he becomes so excited that every sentence he speaks ends with three exclamation marks.