Bravery and Faith?
A. A high Bravery is almost always good. It increases your chance of using Reaction Abilities, and makes certain weapon types (fists, knight’s swords, and katanas) stronger. The only advantage of low Bravery is that helps you find rare items with the Treasure Hunter ability, but you can just keep a single low-Bravery character for that purpose. Faith makes a character’s magick more effective, but also makes enemy magick more effective when used against that character. So, generally, you’ll want your magick users to have high Faith (to make their magick stronger) and characters not using magick to have low Faith (to defend them from enemy magick). See the Bravery and Faith section for more specific details, as well as tips on raising/lowering Bravery and Faith.