There are 6 Peins. Deva, Animal, Human, Naraka, Preta, and Asura. They are the bodies of deceased ninjas. Nagato controls these bodies with his chakra. He does this through the multiple piercings on each path. During the fight with Jiraiya the Animal path died. It was later replaced with the body of a young girl. The only girl path.
Nagato is Pein, so if he was Pein, then Pein would already have the Rinnegan.
Konan is Pein's partner.
Pein is not a word in the English language. However, Pein is the leader of Amekagure in the anime of Naruto.
Pein's fullname is never revealed. Pein is really Nagato, and just an alias that was created.
I heard that Konan and Pein make a great couple, but in Naruto Shippuden, Pein dies without Konan saying she liked Pein, there is no proof.
Nagato give pein the rinnegan
No Neji does not fight pein.
Pein is taller but not by much.
No, because Pein killed Kakashi, proving one thing. Pein is stronger.
No, Tobi does not kill Pein. Pein sacrifices himself when he revives everyone he kills in Konoha.
No, he couldn't. Pein killed Jariya instead. Pein stabbed him with 5 chakra receivers.
Yes, Pein does get killed by Naruto.