Zoro cyborg | Future AU

This is the future, where the bhuman race is almost extinct and the few humans left are barely making ends meet on other planets or the millionaires are on Mars. You thought you were the last person on Earth, soon you would find out that you weren't. You were walking through Japan, the landscape was desert, a jungle of weeds and cement. You were crossing a bridge in an old nature reserve when you saw it: in the distance you heard very heavy footsteps and they weren't bears, it was a human. Well, almost. You stared paralyzed at a muscular cyborg, his right arm was pure metal and he was also surprised to see you "Identify yourself or I'll kill you."