1) Kaguya: Ate Fruit
2) Sage of Six Paths: Born Epic. All he had to do was hone his skills and learn what he could do
3) Obito: Kamui (Gained through kakashi killing RIN) Senju body: gained through Madara gift, and Juubi: gained due to the alliance pinning it down and making it immobile.
4) Naruto/Sasuke: Plot and hard work but mostly plot and gifts
5) Kabuto: Literally took a needle injection of OPness and became OP
2) Sage of Six Paths: Born Epic. All he had to do was hone his skills and learn what he could do
3) Obito: Kamui (Gained through kakashi killing RIN) Senju body: gained through Madara gift, and Juubi: gained due to the alliance pinning it down and making it immobile.
4) Naruto/Sasuke: Plot and hard work but mostly plot and gifts
5) Kabuto: Literally took a needle injection of OPness and became OP