You could change them to classes that get good skills. Are any of their stat numbers blue? (I think that's what color it is, but I have a horrible memory) If they aren't, use a second seal on them and either change to a class you want them in, or just have them "change" to the same class they are now. That itself won't change their stats, but they can level up 20 more times.
[{I may try that. I think I have a few second seals. Thanks you for the tip!













