I have a problem... I got UGH! Adray... How do I get Nel back and also how do I get Abel back too?

Adray is like Cloud in Final Fantasy Tactics... I don't know if he's a good characters, even though they talk about him like a legend in the game, (which is why I made the mistake of getting him and loosing my precious Nel), but I just don't have the desire to level him up...

NEL!!! Come back Nel!!! Oohohohohoooooo I'm sorry Nel! I'm sorry! Come back!!!!