Niko Is a servant of the Count Roi Di'll Santo,or Count Roi,who wields the darkness relique,a powerful artifac that can destroy and create Worlds,but Niko wants to steal it and use it to rule everything,along with the middle heir of chaos (descendant of the relique) Norihime (who with her sisters are trying to stop Count Roi),using her as a puppet and host for the relique and funtion together..
he can travel dimensions and worlds, he's charming,manipulative,a mastermind and calculating