Got it and I'm already starting to stress out over what's to come. I don't think I'm OCD, but this game brings that out of me. So a few more questions.
1. Is there anybody you absolutely SHOULDN'T use? I vowed to not use any sort of character FAQ for this game, but I can already imagine the team I make being ass.
2. Do unlocking the side missions require you to do obscure things you possibly couldn't have known like beat a chapter in 10 turns or something?
1. There's probably a few characters that'll take longer to get good than others, but nobody's truly horrible in this game, especially since there's infinite EXP/levels thanks to skirmishes/DLC. The only person to 'avoid' would be Frederick early on because he'll eat up all the EXP your other units could be getting.
2. Several of them are unlocked automatically when you finish certain chapters. The others are unlocked by having certain characters married (generally the females). I believe there'll be some late-game ones as free DLC later.