Kakuzu could be another important character. He is known for his greed and self - interest. His interactions with Obito could be interesting. He might see Obito as a threat to his own plans within the Akatsuki or he could try to make a deal with Obito if he thinks there's something to gain from it.
Obviously, Obito is one of the main characters. He has a complex backstory and his presence is bound to have a big impact on the Akatsuki.
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.
Obviously, Sakura would be one of the main characters. And the members of the Akatsuki would also be important. For example, characters like Itachi or Pain might play significant roles as they are key figures in the Akatsuki. They could be mentors or antagonists to Sakura depending on how the story is written.
One possible interesting plot could be Obito revealing his true identity to the Akatsuki members. It would create a huge shock and change the dynamics within the group.
In the 'akatsuki watch battle of gods fanfiction', the Akatsuki members are bound to be the main focus. This includes Sasori, Deidara, and Hidan. However, when it comes to the 'Battle of Gods' part, characters like Whis, who is Beerus' attendant, could also play a significant role as the Akatsuki observe the interactions and battles among these Dragon Ball characters.
Most likely, Tom from Tom's world and Edd from Edd's world would be main characters. They are the central figures in their respective worlds and would probably drive the story forward when the two worlds meet.
The main characters are Yugi and Yusaku. Yugi is a character with a long history in the Duel Monsters universe. He has a group of friends and has faced many challenges. Yusaku, on the other hand, is more of a loner who uses his hacking skills in dueling. In the fanfiction, they will be the central focus as their paths cross and they interact with each other. Their different personalities and dueling styles will drive the story forward, whether they become friends, rivals, or a combination of both.
Obviously, Percy would be one of the main characters. And of course, the gods would play important roles too. Gods like Zeus, Poseidon, and Athena are likely to be there. Percy's friends from the demigod world, like Annabeth, might also make appearances.
Obviously, Naruto would be one of the main characters. He's the central figure from the Naruto universe. And then there would be the Pokegirl. She could be any type of Pokegirl, like a Pikachu - girl or a Charmander - girl. Their different personalities and abilities would drive the story forward.
The main characters are Peter and the Avengers. But we might also see some side characters like Happy Hogan who could be involved in some way. Maybe he's the one who arranges the initial meeting between Peter and the Avengers. And Pepper Potts could also make an appearance, giving her take on Peter's presence in the Avengers' world.
There could be other supporting characters too. Maybe some of Harry's friends from Hogwarts like Hermione and Ron could make an appearance in the fanfiction. They might be initially skeptical of Carskile but then grow to accept him. And on Carskile's side, he could have his own set of friends or family members who play a role in the story, for example, his sister who gives him advice on how to deal with Harry.