She was invited to become an Akibaranger because she wanted to excel in karate. At first, she barely had any interest in being an Akibaranger, until she donned her AkibaBlue suit. She’s a very serious person, but for some reason, there’s a bear on her AkibaBlue underwear. She’s actually a big fan of Aoi.
She can be insensitive and harsh, especially with Nobuo Akagi. She is quite reluctant when transforming and doing a roll call (until training with Sentai stunt veteran Kazuo Niibori), as well as being nowhere near as knowledgeable in Otaku culture as her other teammates are.
Season 2 began with a retcon of the events of the latter half of Season 1, changing the continuity so that it was Aoyagi, not Nobuo, who was scouted by the Pentagon. Whilst she was shown to have resisted at first, unlike Nobuo, she eventually conceded and accepted their offer, leaving the team shortly before the second season. Though the Akibarangers eventually came to realise that this was again the work of Hatte Saburo, they did not attempt to reverse the situation, and Aoyagi presumably continues to work at the Pentagon.