Aiko Senoo (妹尾あいこ, Senō Aiko) is one of the main characters and the third Ojamajo, officially joining the group with Hazuki Fujiwara after they spy on Doremi Harukaze in the Maho-do. Aiko is from Tengachaya Osaka, who transferred to Misora with her father due to his work. Aiko is known for her distinctive Kansai-dialect and often complains when others imitate it. She has the Osaka comedy routine down and is a very smart bargainer.