Tsukuyomi: https://imgur.com/a/mINOFee

Yotsuyu's grace and beauty belie a heart of stone and a will to survive by any means. A cruel, sadistic ruler, she scorns Domans due to her painful childhood and marriage to an abusive noble. Under the pretext of purging radical elements, and satisfying her personal arousal from seeing such inhumane acts on Domans carried out, Yotsuyu perpetrated numerous atrocities against her own people. Yotsuyu herself stated that her hatred for Doma was like an abyss, bottomless and insatiable.

Her rage and sadism is centered on Domans specifically, for Yotsuyu herself stated after having her brute Grynewaht beat a group of Red Kojin that she felt little to no satisfaction compared to a Doman getting beaten. She recounts to Lord Hien that she felt true bliss and satisfaction when she found a beaten and agonizing Doman vagrant.

Though loyal to the Garlean Empire, specifically Zenos yae Galvus, Yotsuyu tends to be verbally abusive to her subordinates, Grynewaht especially, mainly to get them to obey her. However, she is extremely fearful of the Garlean prince, for she knows that he does not tolerate failure and thus is desperate to stay upon his good graces.

Yotsuys wasn't always hateful but instead she was depressed and lonely, especially during her early childhood and young adult life. Her former master, when she was a courtesan, described her when her father sold her as "more doll than women" and having "eyes that had given up on life." Her rage and hate only surfaced when she was given the chance by the Garleans.

Following her memory loss as "Tsuyu", she becomes more child-like and vulnerable, always at Gosetsu's side for safety. Lord Hien observed her change of behavior towards Gosetsu as "a hound at his throat to a pup at his feet." Her genuine care for him is such that she ran off to Namai alone just to purchase a persimmon for him. When confronted by the people whose lives she made miserable, she fell to her knees crying, apologizing for what she had done, despite having forgotten her past transgressions. Yugiri shadowed her when she was alone, confirming that her emotions were genuine rather than part of a ruse as she initially suspected. Gosetsu's presence had a profound effect on her as even when she regained her memories, she attempted to take her own life, feeling undeserved of his kindness after all she had done to him. This manifested greatly when a ghost of him appeared during her battle as a primal to defend her from a specter of Zenos that tried to cut her down to feed her suffering.

Apparently, Yotsuyu's true goal was to make her family pay for the torment they made her endure, for she accepts that it was they who made her the monster Doma fears and hates.

Tsukuyomi shares the same minds and personality with her human self. She also smokes with a pipe.