For the WoB, I tend to stick to Stray Cat and Lesser Lopros for most of my needs. Cat Scratch does ridiculous single target damage and Fireball is a great group hitting spell.

In the WoR, My preferred uses are Magic Pot for defensive healing, I love getting Yojimbo just to regain Leo's Shock ability. Io's Flare Star is also useful and toying with enemies with Rafflesia's Charm skill is also fun. I don't teach magic to Gau anymore as he really doesn't need it.