How would it...? Seriously?
Man, it's like 99% of the world population wishes they had invisibility as a super power because they could finally do this, or that, or whatever. Who the hell would want to *just* be invisible when you could be a freakin' ninja??? Invisibility built into the package, secret mystical arts, epic elite assassin abilities...the list goes on! I cannot think of a single facet of day to day existence that would NOT be improved by slapping NINJA on top of it and calling it a day. In the holy trinity of ninja/pirate/robot, the black clad masters of the night win hands down in my book
As for making me a better person, well, having that much power in the palm of your hands (and feet. and ninja-to. and...well, you get the idea) would be one helluva temptation. A person could go either way there...give in and let it take you over to the point of becoming that which is most hated and feared in existence, OR face up to the temptation and become (eventually) one of the revered white-beards cryptically doling out nuggets of wisdom to the random folk who accidentally or by design stumble upon one of the world's hidden treasures. I would like to think that I would have the character to go the way of the wise elder and become a force for good and decency.
I could be wrong though...