xX_Overlord_N_Xx
Author, if the MC is going to go to different worlds, if he is going to have different love relationships with the heroines of each world, but he has to be small in each world. An example would be the World of Naruto: now you could just put Hinata Ă Kaguya Ă Konan Ă MC. After all Kaguya was betrayed by her children for believing a talking toad, and a pervert of a prophecy. Don't make Sasuke go to Orochimaru, when the MC can make him strong.