Rei

Rei Kibutsuji is a minor character in Kimetsu no Yaiba series. She is the human wife of Muzan Kibutsuji and the mother of an unnamed girl.

Appearance
Rei is a young woman with a pair of small jewelry earings with a light yellow-green white hat. She also has a power blue scarf wrapped around her neck. Her tops are long sleeved white shirt and her bottom is a dress colored in power blue color.

Abilities
Unlike her husband Muzan Kibutsuji, she doesn't have any powers/weapons/abilities since she's not a demon nor a demon slayer member.

Trivia

 * She and her daughter doesn't know that Muzan is a demon that eats people like her.
 * Although her full name was never mentioned, it's still evident that her name is 'Rei Kibutsuji' since Muzan mentioned her first name as Rei in Episode 6 / Chapter 14 and since her husband's last name is Kibutsuji.