Same with me! It was my only PSP game I enjoyed back when my console was working, and I probably played through the game like ten times trying to get every single item and secret character, like retrieving the tynar rouge on Agrias' birthday or getting Balthier and Cloud to join your party
This is almost a necro but i'm glad to see someone who had a similar experience! But, hehe, I sort of cheated for the secret characters by looking up how to get them. I wouldn't have every figured out how to get Balthier, for example, by myself since you have to read specific rumors and travel to specific towns. ^.^