[@Mokley] His kindness and goodwill compel him to help others in need even when he really isn't in a position to. For example, a damsel in distress being robbed by a group of thugs. Others might look the other way, not wanting to get themselves into trouble or a dangerous situation, but Hatori couldn't do that. He might be able to win the battle, but would probably be pretty beat up and earn himself some new wounds to take care of. 

There's also his merciful nature, preferring not to shed blood unless it's necessary. After defeating or disarming his opponents he normally allows then to surrender and live another day, even though they might eventually return just to backstab him.

I could definitely see the emperor trying to expand to other islands as well, I mean after all he is motivated by greed and a lust for glory haha.