One common theme is power acquisition. Naruto or other characters often gain Otsutsuki - like powers and have to learn to control them. For example, they might inherit the ability to use unique dojutsu or have enhanced physical abilities.
Another theme is the clash of cultures. The Otsutsuki have a very different way of life and set of values compared to the ninja in Naruto's world. Fanfictions often explore how these two different cultures interact, whether it's through conflict or attempts at cooperation. For instance, some stories show how the Otsutsuki's view on chakra usage differs from the ninja's and how this causes misunderstandings. This can lead to interesting plot developments as characters from both sides try to figure out each other.
Power is a common theme. Since the Otsutsuki are a powerful clan in Naruto, OCs often deal with issues of power acquisition, control, and how to use it. For example, an OC might struggle with the newfound power they inherit from their Otsutsuki heritage.
Power is a common theme. Since Momoshiki is such a powerful character, many fanfictions explore how his power affects the Naruto world and the characters in it.
Well, there are several. Identity crisis is quite common as the OC is caught between their Otsutsuki heritage and their new life with the Akatsuki. Survival is another big one. The Akatsuki is a dangerous group, and the OC has to find ways to survive among them. And of course, there's the overarching theme of the Naruto universe, which is the pursuit of power and the consequences that come with it. The OC, being related to the Otsutsuki, is often in the middle of this power - hungry world and has to make choices that will affect not only themselves but also the people around them.
One common theme is power dynamics. Since Kaguya is extremely powerful, fanfictions often explore how Naruto, with his own considerable strength, interacts with her. Another theme is redemption, as mentioned before, where Naruto tries to redeem Kaguya. Also, there's the theme of forbidden love because of their very different natures and the fact that Kaguya was once an enemy.
One common theme could be redemption. Kaguya has done a lot of bad things in the Naruto lore, and Naruto could be the one to bring out her good side through love. Another theme might be the power of love across different time periods, as Kaguya is from an ancient time and Naruto is from the present in the story's context.
Well, a frequent theme is the clash of cultures. Harry comes from the wizarding world, but with his Otsutsuki side, there is often a struggle between the two different cultures. He has to figure out how to balance the magic he has known all his life with the strange and powerful abilities of the Otsutsuki. Also, friendship and loyalty are common themes. His friends in the wizarding world may not understand his new powers at first, but they still stand by him, and this is explored in many fanfictions. In addition, there are fanfictions that deal with the theme of prophecy. Harry's Otsutsuki blood may be linked to some ancient prophecies, and he has to fulfill his destiny as per these prophecies.
The theme of mystery is also common in Kaguya Otsutsuki fanfiction. Her character has a lot of mystery surrounding her, and fanfictions often try to solve these mysteries. For example, what was her life like before she came to the ninja world? And what secrets does she still hold? Writers use these questions to create engaging stories.
A common theme is power discovery. Sakura often discovers new powers related to the Otsutsuki in these fanfictions. For example, she might unlock some unique abilities that are connected to their ancient lore.
Friendship is a very common theme. Since it's about Naruto and his friends in a crossover, it often shows how their bonds are strengthened or tested in the new situations. For example, they might have to rely on each other more than ever.
One great 'naruto otsutsuki crossover fanfiction' is 'Naruto: Otsutsuki Ascension'. It has an interesting plot where Naruto gains some of the Otsutsuki powers in a very unique way. The character development is well - done as he struggles to control these new powers while still being true to his ninja way.