|“||Don't you 'nothing' me, you little asshole! You've got a knife and an animal in your hands! ... Are you for real?! You realize that no one likes a smartass, right? You'd better cool that sass mouth, or you'll grow up to be even more of a good-for-nothing dirtbag than you already are.||”|
—Haruna Kizami, Corpse Party (CHAPTER 4)
Haruna is a teenage woman with above average height and average weight. She has long purplish blue hair with neck length sideburns and grey eyes. She wears St. Catherine Academy High School female uniform, consisting of a cornflower blue sailor fuku with Prussian blue collar and fallow brown stripes, a white ribbon, a light grey dress underneath, white socks, and brown shoes. She carries a brown school satchel on her right hand.
Haruna is the eldest daughter of the Kizami family and Yuuya's older sister. She's an honour student with excellent grades and renowned for her intelligence and beauty. Both male and female students look up to her. She's very disciplined and strict with herself, and expects the same from others. She doesn't hesitate to scold her classmates if they act sloppily or get into fights.
She acts the same way with her family and doesn't tolerate when her brothers act dishonestly. She's particularly mindful of Yuuya and is always making sure that he doesn't do any misdeeds.
Haruna appears in the fourth chapter during Yuuya's flashback. He remembers back when he was eight years old and she prevented him from slicing up Kensuke Kurosaki's pet hamster with a box cutter. Scolding him, she warns Yuuya that unless he changes, he'll grow up to be even worse than he is now, though this doesn't seem to bother him.
Corpse Party: Book of Shadows
Episode #6; 『Mire』
Haruna appears in Yuuya's flashback. It is revealed her and his brother were the ones who looked out for him. She scolds Yuuya and drags him away when he attacked his brother, Kouki, who punched him for burning an animal, and tried to teach him the importance of life. She asks Yuuya if he's all right and says he will understand when he is older. She tells him they love him and that he is a good kid, before trying to get him to make a grave for the animal. When he says a trash can would be fine, she scolds him for being so cold and tells him he will be alone his whole life.
- Haruna is the second tallest female character in the series at 168 cm (5'6"), behind Kuon Niwa.