Yūkimaru's Mother

Background
Yūkimaru lived with his unnamed mother in a village that was attacked by Orochimaru during his childhood. Guren was one of the ninja raiding the village, killing everyone she came across. When she collapsed, it was Yūkimaru's mother who tended her. When Guren woke up, she said she would close her eyes and let her escape as an act of gratefulness towards the kind woman. However, Guren still had to follow Orochimaru's orders, and when they met again Guren had to kill her to keep her master's approval. When Yūkimaru's mother fell, her blood fell out of her body and onto the camellias nearby. Their pure white color was changed to red as the blood was absorbed by the camellia.

Three-Tails Arc
Years later, Guren sees a vision of Yūkimaru's mother created by the Three-Tailed Beast's mist. She told Yūkimaru's mother that she was sorry and felt regret for killing her. Guren also promised she would protect her son, Yūkimaru, forever with her life.