A group of monkeys might be the main protectors. Monkeys are known for their agility and intelligence. They could swing from tree to tree, launching surprise attacks on Naruto's foes. They could also use their knowledge of the forest terrain to lead Naruto to safety.
Foxes are quite common. Given Naruto's connection with the Nine - Tailed Fox, it makes sense that in fanfiction, he might be able to control other foxes. They can be used for scouting or as distractions in battles.
In some Naruto fanfictions, Naruto might absorb animals through special jutsus or abilities. For example, he could have a unique kekkei genkai that allows him to take in the essence or chakra of animals. It could also be related to some sort of pact or bond he forms with the animals, which then enables him to absorb their powers.
A fanfiction could involve Sakura finding an injured animal during a mission. She uses her medical skills to heal it. The animal turns out to be a magical creature that can transform into different forms. It then decides to stay with Sakura and helps her in her battles against the Akatsuki, using its special powers.
Well, it can change the flow of battles a great deal. For example, in some fanfictions, Naruto can use his animal - controlling ability to summon a horde of powerful animals to fight against enemies. This gives him an edge in combat and can turn the tide of a losing battle.
Well, in this 'naruto god of animals fanfiction', perhaps Naruto is seen as a protector of all animals in the Naruto universe. He might gain new jutsu or powers that are based on different animals' characteristics. For example, he could have the speed of a cheetah, the strength of a bear, and the stealth of a panther. This would make him an even more formidable ninja and give him a unique role in the story, different from his normal ninja duties. It could also involve him forming special bonds with certain animals that help him in battles or in solving mysteries within the Naruto world.
Well, it could be that in the fanfiction world, Naruto has a special bond with nature spirits which gives him the power to control animals. He might have to enter a trance - like state to connect with the animals' minds and then be able to order them around. For example, he could use this power to make birds act as spies or have wolves guard a certain area.
In fanfiction, when Naruto absorbs animals, it might lead to a change in his personality. If he absorbs a predator like a wolf, he could become more aggressive or assertive. On the physical side, his body might adapt to the absorbed animals' traits, which could cause some difficulties in his normal ninja activities at first. Socially, some people in the Naruto world might see him as a freak or a powerful new threat, depending on their views.
He could go on adventures where he teams up with powerful animals. For instance, he might form an alliance with a giant eagle to explore uncharted areas from the sky.
In a fanfic, Naruto could be a fox, as he has the Nine - Tails within him. It would be really cool to see him with all the fox - like traits, like being sly yet loyal. Sasuke might be an eagle, with his sharp vision and solitary nature, always looking out from above. Sakura could be a deer, gentle yet strong when needed, especially when protecting her friends.