This nika didn't exist until 50 chapters ago my dude...
basically the kaguya of the op verse but he's the mc so we will have to see his mug and constant retconned wanking of him and how amazing and interesting and heroic he is until the manga ends. Which seems to be like at least 5-7 more YEARS.
at least kaguya was done with in a couple of chapters. We will have to bear this incessant nika glazing for 300+ chapters...