Konan was a kunoichi from Amegakure and a member of Akatsuki. She was partnered with Nagato, and was the only member to call him by his name. After Nagato's death, she defected from the organisation and became the leader of Amegakure before her own death.
She like Nagato and Yahiko was left an orphan by the Second Shinobi World War. She first was befriended by Yahiko, working with him to survive. She then came to see a dying Nagato, and his dog. Saving both of them, she took them back to her and Yahiko's hideout. She had to fight Yahiko to convince him to let Nagato stay.
Staunchly loyal to her friends, she told Yahiko and Nagato to leave her when she was kidnapped by Hanzo. Yahiko, however, decided to sacrifice to save his friend, and implied lover. She then decided to stay loyal to Nagato, as he was entrusted by Yahiko to bring peace to the world.
Konan eventually showed the same loyalty to Naruto, once Nagato entrusts him with his mission to save the world from eternal war. Konan was so loyal to Nagato, Yahiko, and even Naruto, that she eventually confronted Tobi in one on one battle in order to prevent him from taking Nagato's Rinnegan. She dies true to her resolve, although she did fail in keeping Tobi from the Rinnegan.