Shichijou, Aria

七条アリア

Aria is a pale-skinned teenage girl, widely recognized as exceptionally beautiful and attractive. She has back-length light brown hair with bangs falling over the right side of her face and a single medium-length strand on the left, along with light brown eyes. She is easily the most buxom character in the series.
She frequently displays a calm and gentle expression that gives her a motherly appearance. Even Takatoshi Tsuda, who is typically immune to the charms of the girls around him, cannot resist her allure.
Although she is the daughter of the wealthy Shichijou Zaibatsu, Aria is far from spoiled. Instead, she is extremely generous and more than willing to spend her wealth for her friends. On several occasions, she has taken Student Council members to various places at her own expense, and on a few others, she has included even more people.
One of Aria's most notable quirks is her airheadedness. This combines with a sense of "common sense" that differs from most people's, likely due to her upbringing, creating a surreal perception of the world and events around her. While she is often level-headed and one of the most reliable people in school as Student Council Secretary, she has also shown misperceptions, presumptions, and made mistakes or done things bordering on the nonsensical, such as forgetting that schools do not have escalators or sliding doors, rarely wearing underwear, or wearing a chastity belt.
Among the Student Council members (excluding Takatoshi Tsuda), Aria is the most mature. She has a warm, motherly demeanor and is so calm that Shino Amakusa and Suzu Hagimura often overreact in comparison.
That said, she is also the most perverted and twisted member of the Student Council, surpassing even Shino because Aria's sexual interests tend to be more extreme. She has expressed interest in things like enemas (for sexual purposes), exhibitionism, and bondage (both as a submissive and as a dominant). This is arguably partly due to her parents and upbringing, as she has been exposed to material and events that may have influenced her during childhood.