Haruka Ayatsuji is a young girl with chin-length brown hair, styled in a bob cut, and brown eyes.
She wears the standard Operator uniform: a white dress shirt under a black suit with large orange stripes divided into two parts on the sides of the sleeves and another down the front flap, and also a headset.
Four years prior to the start of the series, she had longer hair, reaching past her shoulder.
Not much is known about her personality. She seems to be very friendly, as she greeted Osamu with a smile when he visited Arashiyama Unit's Operation Room. According to Daisuke Ashihara, she has a lot of fans, with a Madonna existence in Border. She was shown to like sweets a lot, as shown by her happy reaction to the dorayakis Shiori sent to her. She is also very polite and usually refers to others by their surnames, although she refers to Kitora by her first name.
They appear to have a close relationship, as Ayatsuji is the only one who calls Kitora by her first name, calling her "Ai-chan" instead of her surname.
They appear to have a friendly relationship, as Shiori presented her with dorayakis from a good shop via Osamu.
Like the other members of Arashiyama unit except for Kitora, Ayatsuji is very friendly to Osamu.
- (To Osamu Mikumo) "Oh, welcome, Mikumo. Pleased to meet you, I'm Ayatsuji. Wait for a moment, Arashiyama will be here soon." 
- "Haruka" (遥?) means "far away, distant, remote", and is a common female name in Japan. "Aya" (綾?) means "thin silk, damask silk", while "Tsuji" (辻?) means "crossroads, street".
- Her Japanese voice actress, Shiori Mikami, also voices Aoba Harukawa, while her English voice actress, Michelle Molineux, also voices Ichinose.
- According to volume 1, Ayatsuji likes tidying up, reading and gummies.