Sakura could also be a good choice. She's a strong - willed character, and her medical ninjutsu skills could come in handy when dealing with the Deva Path. Maybe she could try to heal some of the damage that the Deva Path has suffered over time, and in the process, they develop a strange sort of friendship.
Naruto himself would be an interesting character to pair with the Deva Path. Their different outlooks on life and power could lead to some great character interactions. Naruto's belief in the good in people might even start to influence the Deva Path.
Iruka sensei could be an unexpected but great character to pair with the Deva Path. Iruka has a big heart and is good at understanding people. He could try to reach out to the Deva Path on an emotional level, teaching it about things like family and friendship, which are concepts that the Deva Path may not fully understand due to its nature as a part of Pain's power.