Nice Story. Keep it on Library. I think MC has a potential to be Good Neutral Character. I just hope MC not so Over Power and MC can death if he make mistake in battle. Background story for MC with another Character is good, they (MC and His Friend) still think and act like toddler, its a good Point for me.
Really i just hope MC is not so OP because it will ruin MC friendship and MC background. at least i hope MC friend can keep up with MC in term Battle Power.