Priscilla. She's more capable of following your group, and Anima magic is more useful in the game than Light magic, from what I can tell. If you really wanted to use Light magic, there's nothing wrong with using Lucius.
Actually, I just realized that this was the wrong place to post this, so I'll go with something else.
As much as how much damage Hurricane Irene did, I do feel that it was blown out of proportion prior.
Good day to you, and welcome to the Forest!
If you're into ROM hacking, I believe that we have a small and active community here just for you, so you might like it!
We really need a Lex smiley...