The Element KKG and KKT and their users.
Mokuton/Wood (Earth + Water) --- Hashirama, Yamato, Zetsu, Juubi/Kaguya, Danzo, Madara and Obito (w/ Hashi cells)
Ice (Water + Wind) --- Haku and the Yuki Clan
Lava (Fire + Earth) --- Mei, Roshi, Naruto, Kurotsuchi
Boil/Vapor (Fire + Water) --- Mei
Dust (Fire + Earth + Wind) --- Muu, Ohnoki
Storm (Water + Lightning) --- Darui
Magnet (Wind + Earth) 3rd KazeKage, Rasa (4th Kazekage), Naruto
Explosion (Lighting + Earth) --- Deidara + Gari
Scorch (Fire + Wind) --- Pakura
There's nothing for a Rinnegan or Sharigan user to copy here. They have to be born with the right combination of elements. Even if you are a person with multiple chakra natures (e.g. Kakashi and Hiruzen), you still wouldn't have access to a specific KKG or KKT.