One common theme is animals having chakra. Just like the human characters in Naruto, animals in these fanfictions can also possess and manipulate chakra for various abilities like running super - fast or using elemental attacks.
Another theme is animals forming clans or tribes similar to the ninja clans in Naruto. For instance, a pack of wolves might form a clan where they have their own hierarchy, unique jutsus, and a code of honor. These animal clans can then interact with the human ninja clans in the story, sometimes as allies and sometimes as rivals.
Friendship is a common theme. For example, female animals from different species might become friends and help each other out in difficult situations.
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.
Crows are also often seen. Crows are intelligent and can be used for spying or sending messages. Naruto in fanfiction might control them to gather intelligence on his enemies. And they can be very stealthy, flying around unnoticed most of the time.
One of the common themes is isolation. Many antagonists in Naruto, and in these fanfictions, are isolated either by choice or circumstances. This isolation can fuel their antagonist - like behavior. They might feel that they are different from others and that the world has wronged them. For example, a character with a unique and feared power might be shunned by society, leading them to turn against it. Also, the theme of betrayal often pops up. A character might have been betrayed in the past and now they are out for revenge, acting as an antagonist towards those they once considered friends or allies.
Common themes in 'Aizen like Naruto fanfiction' include the idea of a character being an outlier in terms of power and intellect. Aizen was known for his extreme intelligence and overwhelming power in Bleach, and in these fanfictions, characters with his likeness are often far beyond the normal capabilities of the Naruto characters. Another theme is the idea of a false facade. Aizen was very good at hiding his true intentions, and in Naruto fanfictions, similar characters often put on a front to deceive others. Additionally, the theme of a grand plan that spans across the Naruto world is common. Just as Aizen had a large - scale plan in Bleach, characters in these fanfictions also have elaborate plans that involve multiple aspects of the Naruto universe.
The theme of growth is also prevalent. They both start as somewhat naive boys and grow into powerful and more mature individuals. In 'naruto is like killua fanfiction', you might see how they influence each other's growth, for example, Naruto's positive outlook might affect Killua's more cynical view at times, and vice versa.
In fanfiction, Naruto as an animal? He could be a golden retriever. They are friendly, full of energy and loyalty, just like Naruto's nature. He would be running around, making friends everywhere. For Sasuke, a black panther suits him. Panthers are stealthy and powerful, representing Sasuke's combat skills and his mysterious side. As for Hinata, a white rabbit would be appropriate. Rabbits are shy and gentle, which reflects Hinata's personality at first, but they can also be brave when protecting their loved ones.
One common theme is mentorship. Since Kakashi is a great mentor in the original series, in these fanfictions, Naruto often tries to take on a similar role. He might mentor the younger generation, passing on the lessons he learned from Kakashi.
One common theme is survival. The protagonist has to find ways to survive in the animals' territory. For example, in some stories, a human is kidnapped by a pack of wolves and has to figure out how to get food and shelter while among them. Another theme is communication. There might be attempts to communicate with the animals, either through body language or some kind of telepathic connection. And then there's the theme of transformation. Sometimes the kidnapped person starts to adapt to the animals' way of life and may even start to take on some of their characteristics.
Another theme could be the idea of the animal kingdom as a microcosm of human society. In 'the animals novel', animals might have their own hierarchies, power struggles, and social norms, much like humans do. For example, there could be a dominant species or group that controls resources, while others are in a more subservient position. This can be used to comment on human social structures in a more allegorical way.