Takane Hiiragi is the fifth of six sisters in the Hiiragi family. She possesses vibrant red hair, often styled with spiky bangs or twin tails, complemented by green tareme-shaped eyes, a noticeable fang, and a slim, pale frame standing 159 cm tall with measurements of 80-54-82.

Her personality is stubborn, spoiled, and short-tempered, frequently grumbling and displaying a modern tsundere attitude. She directs physical outbursts, particularly towards her adoptive brother Kuuya, treating him like a servant and constantly ordering him to fetch her favorite yakisoba. She reacts explosively when her sister Serori eats her snacks.

Despite being the second youngest, Takane is treated as the baby of the family, a role she resents yet maintains through rebellious teenage behavior. She enjoys reading shoujo manga, which invites teasing from her sisters. Contradicting her abrasive nature, her hobby is playing the piano.

Within the family structure, Takane is also identified as the fourth sister. She wears a varied wardrobe including cheerleading uniforms, mini-dresses, pajamas, and swimwear, often accessorized with bracelets and ribbon hair ties. She participates in cosplay and swimming activities.