Who I'm i ?!

They say that human beings are creatures that can surpass they're limits by achieving they're maximum potential but they can also learn from they're mistakes by correcting them but me "hmpf" that's my biggest mistake I can't even be useful to my self let my surroundings so they call me "ONI" i don't know it's meaning but that's the point they're calling me ONI because I doesn't has meaning I'm a ZERO between numbers but that's just the beginning of my story because I'm already a legend.