Setsuna is too kawaisou, more like more comedy version of Hazuki in YamiBou. got a guess that her true form is Tsuruko's bird
about Ayaka, agree that her voice is bad in the OVA, her voice in the first class album sounds a loot more "ojou-sama" than the OVA. But Negi's better, at least he doesn't sounds like MariMite's Tsutako (same CV, Satou Rina)