Haruka is a pretty normal person, but she is not very open to other people as shown when she didn't participate in the class's swimming session where she tends to prefer keeping to herself and not bothering people, simply to avoid trouble. She is considered to have good looks and is often viewed lustfully by boys, thus wanting to seclude herself. She is mostly seen wearing the school's uniform, with the difference that she has the upper button of her shirt undone and her tie relatively loosened. She prefers giving people nicknames the moment she meets them, which is said by Kushida to be a method for her "to appear closer to the people she isn't close to".

Spoiler

In Year 2, Volume 5, Haruka is told off by Kushida when she tries to help the latter. She is then seen aggressively opposing the motion by Ayanokoji to expel Airi Sakura, being her closest friend, to no avail. She is one of the 4 remaining members and the sole remaining girl of the Ayanokoji Group.