I love that she totally has a thing for Aki and he is completely clueless.
Yes, our "Prince Charming" is completely clueless, but Ai is clueless about Aki having a "Tall, dark stranger" partner. ;)
I like that she pops up occasionally to drool over Aki. It shows that other people find him attractive and want to be with him (and not just want to rape him.) It's a nice contrast to all those characters who question Aki's worth.
He's the typical "Prince Charming" of the fairy tales, and this is appealing for the youngest audiences. Don't forget that he went into danger to help Ai (the damsel in distress). Yes, young girls find him really attractive. *o*
I adore this extra! *o* *o* And I like Momohara Ai, even if she's such a "decorative" side character.