Sorra

Sora is an extraterrestrial swordfighter from an unknown planet. He arrives on Earth searching for a worthy challenge.
All that is known about him is that he was the prince and heir to the throne of his home planet, and frequently led his warrior species to battle. Eventually, he grew bored of fighting his enemies and turned against his own people, slaughtering them all.
He then made his way to Earth, searching for a challenge.