Lan Yinzuki was a child "picked up" by the Demon Slayer Corps. The master who taught her the breathing of the moon was killed by demons. She was also a child picked up by the master. Of course, the Demon Slayer Corps adopted Lan Yinzhi.
However, her name is Lunyin Moon, her name is Yue, and she also has another name - Black Death Moon
Purpose: Inspirational (?)