Aya's best known for being the calm, rational voice in her friend group—which is saying something, considering she constantly struggles to read the room. She's Shinobu's classmate and has been tight with Youko since middle school.
On the surface she comes across as bright and graceful, but she's actually pretty shy and timid underneath all that. Fans often note her occasional tsundere moments when it comes to Youko, which keeps things interesting. Her inability to pick up on social cues creates some genuinely funny moments throughout the series, but somehow she still manages to be one of the more level-headed people in the group—a contradiction that kind of works for her character.
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