Born to fight, this monster had been bored his entire life.
He had a few fun times when he had fought against mighty foes, yet when he died.........He regretted everything he had done in his life.
If he didn't had become a Shinigami, maybe he could've live the thrill of battle much more than he did as a Captain.
However it seems that a certain little child that govern the 12 Universes...