A the good 'ole classic one.

Then some other good notes to take, you can only learn 3 spells total on any mage, and they can't be removed, so you gotta pick carefully what they learn.

If you use a Black Belt, around level 10 unequip their weapons and they become stronger with bare fisted attacks then any weapon.

That's about the biggest things I can think of at the moment.

Anyone on the NES version I highly suggest checking out Unne's site since it has the most complete FF I NES info I've ever seen.

Edit: Doh seems likes Unne site is down for maintenance at the moment. Geez and I was just on it yesterday looking up stuff.