|Japanese Name||高円寺 葵 (こうえんじ あおい)|
|Romanized Name||Kōenji Aoi|
|English Name||Aoi Kōenji|
|Debut||Episode 11 - Return to Lancastar|
|Japanese Voice||Airi Furukawa|
|English Voice||Margaret McDonald|
Aoi has short dark blue-purple hair and green eyes.
Aoi is always focused on her mission and works hard as a WOTA member. She often scolds or lectures Mamoru when he is late or not focusing on the task at hand. She is also a fan of Yuka Ichijo. She knows that he is a fan of Suzuko Kanzaki, but also suspects or knows that he loves Yuka as well, possibly even more than Suzuko. This is because she teased him about whether or not he was just rooting for Suzuko when he was trying to get the TV to work so they can watch the General Elections.
- The name Aoi means "hollyhock, althea" (葵).
- Aoi's surname Koenji means "tall, high" (高) (ko), "circle, yen, round" (円) (en) and "temple" (寺) (ji).