Ever heard of Tales of World Mythology Radiant?
It is a game that you can use all of the characters from the Tales of Series,for example

Lloyd Irving, Raine Sage,Genis Sage,Kratos Aurion from Tales of Symphonia
Luke fon Fabre, Tear Grants from Tales of Abyss...

Total 3 games in PSP
Only the first game was release in US

About:
You're the character that has no memory from the past, a character name Kanono discovered you and brought you to the guild.And, your adventure begin

Personal opinion:
I think that the game is interesting and fun in the same time,you can change your career(For example, from Swordman into a Mage, or a thief, or an Archer) Build up your relationship with other character from Tales of series
Storyboard is also interesting too, you will discovered who you are during the adventure