Lol, it seems I'm bringing him up in every thread these days but...here goes...(OMGSPOILERS AHEAD)
Dheginsea. Yeah, you heard me. He just sat by as his fellow men fought each other, the laguz were mistreated and worst of all, his children were taken away from him and abused. He purposefully lied to the whole world, and I'm sure that's taken a pretty heavy toll on his conscience. And he had nobody to support him through all this, he did it all by himself, nobody could understand him. The burdens he carried were his and his alone.
All this because he chose to have unwavering faith, because he wanted to keep his promise, and because he just wanted some peace. I think he's a pretty tragic/sorrowful character, but also a very strong one to endure so many years of suffering.