Well just as a reminder, the first girl Rose is an exchange student and the student council president. Cid used his fight with her to show off a bunch of mob fu as well as took a hit during the terrorist attack to show off more. He later saved her from the terrorists as Shadow. The girl with Beta in the sewer Alexia is the princess. She had a fiancee who was a part of the cult and kidnapped her for a sacrifice or something, but was nuked by Shadow. The girl at the end is Iris, the older sister of Alexia.