Another pair could be Naruto and Kisame. Kisame is a very loyal member of the Akatsuki. If Naruto were to interact with him, he might be able to break through Kisame's loyalty to the Akatsuki's more extreme ideals and show him a different path. Their connection could be based on Naruto's unwavering belief in friendship and Kisame's longing for something more meaningful in his life.
Itachi and Kisame could be a pair with a close bond. Itachi is a very reserved person, but Kisame seems to respect and understand him to some extent. They often work together on missions, and this could be seen as a form of 'family' bond within the Akatsuki. Another possibility is Deidara and Sasori. Despite their differences in art forms, they seem to have a connection. Deidara looks up to Sasori in some ways, like a younger brother might look up to an older one.
Sakura and Deidara. Deidara is an artist with a very unique view of the world. Sakura might be intrigued by his art while at the same time being repelled by his violent and destructive tendencies. Their conversations could be a mix of philosophical debates about art and power, and physical confrontations as they are on opposite sides.
Sakura and Sasuke are very likely allies. Sakura has her medical skills and combat abilities, and Sasuke, despite his past issues, has great power. They've been comrades with Naruto for a long time.
Pain could also be a major character. His ideology and the Akatsuki's goals under his leadership might be affected by the presence of baby Naruto. He might see Naruto as a potential threat to his plans or as an opportunity to change the Akatsuki's path. Also, Konan might be involved as she often has a more empathetic side compared to some of the other Akatsuki members and could play a role in taking care of the baby.
Konan is often very popular. Her paper - like abilities are really cool and in fanfiction, she can be portrayed in many different ways, like a more sympathetic figure who is just caught in a bad situation.
Pein could be another one. As the leader of the Akatsuki, he might see baby Naruto as a means to an end. He could either want to use Naruto for his own grand plans or, in a more interesting twist, be swayed by Naruto's innocence and change his perspective on the Akatsuki's goals.
Definitely Itachi. He has a complex character and his own sense of justice. He might see Naruto as a key to changing the shinobi world in a different way than what the Akatsuki originally planned. Another one could be Kisame. He is loyal to Itachi and would likely follow Itachi's lead in taking care of Naruto.
Naruto is obviously very popular as he is the main character of the original series. His interactions with the Akatsuki members are always a focal point in fanfictions.
Itachi is often a very popular character in Akatsuki fanfiction. His complex backstory, his powerful abilities, and his self - sacrificing nature make him a fascinating character to write about. Writers often explore his relationship with Sasuke more deeply or create scenarios where he didn't have to die.
Pain is also popular. His powerful abilities and his ideology about peace through pain are fascinating. In a fanfiction where Naruto is in the Akatsuki, Pain's reaction to Naruto's presence and how they interact would be a big draw for readers. Kisame might also be popular. His loyalty to the Akatsuki and his shark - like appearance and abilities add an interesting element to the story.