I'd actually recommend Support on everyone over SP Regen as a first skill in OG1. SP Regen only matters so much in marathon battles like you get in OG2 (or Alpha Gaiden, where it doesn't exist ;_;). Support in OG1, on the other hand, is almost broken. Attacker's also always a good bet, except on pilots you're not going to use offensively like Garnet, Radha, and Russel. They're the ones you should give SP Regen so they can spam Bless/Aid.