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In her teen form she has blue/gold starry-eyes with long strawberry/platinum blonde hair that is decorated with three food motif hair clips, and a curvaceous yet petite figure and sexy feminine body line. She wears a pink cardigan and a white and baby blue uniform, with multi-color stockings. It is referred to as chic, and her uniform gives off a cutie pie impression. She often gets the attention of all who passed by her due to her beautiful body and her small, cute face. Her casual wear is usually very fashionable and frilly clothes that most girls her age can be seen wearing.

When she was still a teen, her bosom had developed too much, much to her chagrin.

Coupled with her cute face, Astraea exudes a seemingly playful and childish personality, which makes her very popular with the older students at the school; she is noted by many to be the perfect teenage girl at school and around town. She is at the top of her class (due to her outstanding grades), possesses a leader-like charismatic aura, kind-hearted, excellent in almost everything she does, and despite her popularity, she remains humble thus earning the admiration by her fellow classmates and faculty alike, often having lady-like behavior and mannerisms. She has a rather formal speech, but due to being originally from Akita, she occasionally reverts to its dialect when angry or excited. She sometimes does silly and cutesy poses that even other people such as Sumiye Egnell and Erika Vermillion try to jokingly mimic while the happy-go-lucky Chelia Amicus usally cringes in pain whenever she sees them.

However, with this facade belies a much more NEET nature when she is at home, she lets out of her secret otaku side and cannot tell the difference between the online world and reality, and becomes a loner who has trouble communicating with boys and cute girls, usually avoiding her friends and skipping school if she remains on-line too long. While she is mostly a well-rounded academic student, Astraea is far from being sporty. Her poor performances cause her to worry about any upcoming PE tests, which causes Chieri to tease her, since unlike Astraea, she excels in that domain. She is known for skipping Physical Examination day, just so her measurements won't be taken. She has a complex about her weight, even though she's just a bit thicker than the other girls. She is really good at making candies and sugary pastries, but it becomes a problem as she often eats the confectioneries she makes.

Although she was attractive even before becoming a participant in the Grand Destiny Star Games, Astraea is self-conscious about her weight; so much that when she finds out she put on some weight, she decides to go on a diet, hardly eating anything for 5 days straight. Interestingly enough, Chieri points out that she should be proud of her bust size; Astraea is so focused on her waistline, that she barely give any regard to her sizeable chest. Further research reveals the added weight comes from her breasts having grown in size, which as a running gag among her friends, she has a complex about them. She also is very glutenous when it comes to food and will just about anything that she is offered.

In the local video arcade, she is a well-known gamer who goes by the moniker "Astra", Bianca Argento even sees her as a worthy opponent.