Whimsical and Detached: Often acts spacey, "fluffy," and uses "plush words" to mask a deeper, perhaps melancholic, nature.
Deep-Seated Loneliness: This persona is a reaction to her real-life counterpart's tragic, early death.
Secretive and Observant: She enjoys recording voice memos and, as mentioned on a fan wiki, watching the romantic lives of her peers. 
Her demeanor is a mixture of lighthearted, "fluffy" antics and a profound fear of oblivion, often making her appear both eccentric and deepl