Because the poster asked about Pain, Xiaonan and the others are from the Land of Rain. They were homeless during the Ninja War and were taken in as apprentices by Jiraiya. Pain is not a genius. He has a pair of six paths of reincarnation. Eyes, the poster will know just by looking at it! And Namikaze Suito is the fourth generation. He can be regarded as a genius. Like Naruto, he grew up in Konoha Village and became Jiraiya's apprentice!