It's to justify Aya being in every single game since her inception. In addition to her being one of the strongest youkai in Gensokyo. Such as having TWO abilities when most of the characters only have one.
* Aya is extremely fast, even among the tengu.
* She always carries a fan that allows her to summon enormous winds, a camera, and a notebook full of her observations and pictures.
* Her newspaper, the Bunbunmaru Newspaper, is a gossip rag that's popular among humans and youkai alike.
* Many fear her as a result of her shameless reporting style, and don't want to be written up in her newspaper.
* Though Aya is extremely strong, she's not usually combative unless someone gets in her way.