Besides Rinoa they're missing Paine, Carly, Porom, Freya, Fran, Relm, Refia, Maria, Leila, Ashe and Faris too. While the first few are excusable since they're either lolis (even though Eiko is in this), furries or just too insignificant, it is bizarre the artist left out Rydia, Faris and Ashe, who are quite important characters.
