Rena appears to be a rather busty young woman, with the body of a 17 or 18 year old. Her typical dress is fairly revealing clothing - usually a haltertop that displays her cleavage, and a short-ish skirt. Her waist-length blue-white hair constrasts her startlingly green eyes and olive skin for a beautiful effect. She is curvy in all the right ways. Further, the white angel wings on her back only add to her grace and allure. If you wanted to design a woman who was sexier, you would have trouble, though of course it depends on individual taste.
Despite her apparent sexualization, Rena seems to exude a playful innocence.