Haruka is composed yet bold, unafraid to talk back and tease her friends. She is rather sporty, liking basketball, and as a child she was quite competitive. She also loves penguins, owns a ton of penguin merch. She is a strict and dedicated person. However, due to her overly diligent nature, she has difficulty relaxing and giving herself a break. She restricts herself on sweets and pastries, which, in response, causes cravings. She is attentive to the schedules and specials of pastry shops.