Although her name does not begin with an "I", the "Ai" from "Aiko" represents an "i" sound in Japanese, indirectly marking her as an "i."

She is Gemini, quite ditzy, scatterbrained, and is prone to losing or misplacing her possessions, but is also very nice, kind, and unbelievably cheerful, even in bad situations. She also has an uncanny resemblance to Iori Yoshizuki, save for a mole under her left eye. Her close resemblance to Iori causes Seto some complications when she is introduced three-quarters of the way through the manga. She, as well as Seto, fall in love with one another at a later point after they meet. Asou realizes this is a potential problem for Seto and decides to move away in order to keep Seto's and Iori's love intact.

One of the series' running gags is the odd similarities between the women who get in the way of Ichitaka being with Iori. Not only do they all have I names (or AI in the case of Aiko Asou), but they all appear very similar in appearance. Izumi looks like Iori when she has long hair and like Itsuki when she has cut it short. Aiko also looks like Iori but this time more of a near perfect double with the exception of a mole on her cheek.

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