Xister

While not much is known about Xister’s personality, it can be inferred that she is religious, due to her attire. Xister is also seen to be caring towards Fen. Xister also has little regard for her health, as she is seen taking medication with alcohol and smoking two cigarettes at a time.

She is dating with a monster girl name Fen.
and She has a sister name "Vivian"

Xister has long, waist-length hair that is two-toned, with the right side of her hair being an ash blonde, and the left side being a greyish brown. Additionally, a single strand of her hair is dyed light blue. She wears a black cap featuring a white cross in the center atop her head. Upon removing the hat, she is shown to have two black horns. Her upper face is sometimes obscured in shadow, yet her eyes remain visible.

She also appears to have scarring around her eyes and on her forehead. Like most characters, she lacks a neck. She wears a black suit with a matching tie and white collar, with three gray buttons, over a white collared undershirt. She also sports a black belt with a golden buckle, accessorized with a chain and cross. Her attire is completed with black pants and shoes.