Innovation In Avatar

Someone gets reborn as Korra's twin Brother but instead of having cool bending he has an IQ of Doctor doom Iron man Spiderman and Doc Oc combined what will he do the MC basically has a super IQ I will not be going into detail on how everything works im stupid he won't be a Dense person and No Harem I dont get why there are so many Harem FanFics its not realistic in any way