I know a lot of people don't like him, but I fancy Renault from The Blazing Blade. His backstory is that of a mercenary, which might be why he's sturdier than every other Bishop in the series. His base Magic stat is atrocious (Which also makes sense since he is relatively new to being a Bishop), but a couple of Energy Rings fixes that. After this, Renault is the most well-rounded Bishop, and only poor availability holds him back.