Non-Canon[]
Rem (Sloth IF)[]
While she initially distrusts Natsuki Rem, believing her to be the thief who stole her Light Sphere, Zarestia's childish nature leads them to develop something resembling a mother/daughter, or older sister/younger sister, relationship. As a result of their deep bond of mutual affection, Zarestia decides not to kill Rem even after she recovers her full power and murderous urges. Zarestia holds Rem in higher regard than anyone else.
Natsuki Rigel (Sloth IF)[]
She treats Subaru and Rem as family, and their eldest son, Rigel, like family, as an extension of that. She gets displeased by his personality, noting that it is similar to his father's. Zarestia initially wanted to give Rigel her light sphere, but decided that it would be too difficult, and tries to give him a white bracelet that, when broken, will allow her to know his location so that she can save his life if he is in danger. Rigel refuses because his mother told him not to accept gifts from strangers, and that was his first meeting with Zarestia. Zarestia explains her relation with Rigel's parents as they walk to Subaru's workplace, and on the way back to Rigel's home.
Rigel thinks she's beautiful, but also notes her immaturity. He compares her to a little sister, before rejecting the thought in anticipation of his actual little sister's birth.
Later, Zarestia notes that ever since Rigel accepted her bracelet, he never called her. She enjoys having the opportunity to throw food at Rigel during Setsubun.
Halibel (Sloth IF)[]
Zarestia refers to him as "Mutt", during their early interactions. Initially, they were wary and hostile towards the other. Eventually become good acquaintances. Grateful for his and the help the other residents of Banan with retrieving her light sphere.
Natsuki Subaru (Sloth IF)[]
Due to their mutually immature and abrasive personalities, they bicker and squabble. They care for each other, like family, as they bond during Zarestia's 3 month stay with Subaru and his wife, Rem. Zarestia felt thankful for Subaru helping to retrieve her light sphere.
Subaru would note her immaturity, and liken her to a younger sister. Initially hesitant to let Zarestia live with him and Rem, in their room, as they would have trouble sleeping together, Zarestia ends up sleeping in the room, while the married couple moved over to the next. Zarestia regretted insisting on living in the room right next to Rem and Subaru's, as she would hear their voices, at night, with a red face and embarrassment flooding her.