One common theme is friendship. Since Naruto is known for his ability to make friends, it's often explored how he and Gabriel Lemon form a strong bond.
A common theme could be the clash of different worlds. Naruto's ninja world and Gabriel Lemon's world, whatever it may be in the fanfiction, often collide. This leads to interesting cultural and power - based interactions.
Another theme is the idea of power and growth. Naruto is constantly striving to become stronger, and when Gabriel enters the picture, there could be new ways for Naruto to gain power or a new understanding of his own abilities. Gabriel himself might also experience growth in terms of his understanding of the mortal world.
One common theme could be the relationships between the characters. Since it involves Gabriel, there might be themes of friendship or rivalry with other characters from the 'Highschool DxD' universe.
One common theme is the discovery of new powers or abilities. For example, they might find out they have a special connection that gives them unique magical powers when they are together.
One possible theme could be the struggle between good and evil within the context of their relationship. Gabriel is often depicted as a more complex character, sometimes on the wrong side, and Marinette is the hero as Ladybug. Their interactions in fanfiction might revolve around this moral struggle. Also, themes of redemption could be present, where Gabriel might have a chance to turn his actions around because of his relationship with Marinette.
One common theme could be friendship. Given the different backgrounds of Naruto, Gabriel, and Hannah Annafellows, their coming together could be centered around forming strong bonds. Another theme might be the exploration of different worlds. Naruto's world is very different from what Gabriel and Hannah are from, so there could be a lot of world - building and exploration in the fanfiction.
One common theme is the clash of different worlds. For example, when Gabriel Belmont is crossed over with a character from a modern - day setting, there's often a contrast between his medieval - like world and the new, more advanced one. This can lead to interesting storylines about adaptation.
Love and friendship are often explored as well. It could start as a friendship that gradually develops into something more. Or perhaps they are forced to work together due to some external threat and in the process, they develop deep feelings for each other. The stories might also touch on themes of loyalty and sacrifice as their relationship progresses.
One common theme is friendship. Many fanfictions explore how Gabriel and Stiles form a strong bond of friendship. Another theme is mystery, as Gabriel often has an air of mystery about him, and writers like to play with that in relation to Stiles' inquisitive nature.
Often, you'll find themes related to the growth of their relationship from their childhood rivalry to a deeper emotional and physical connection. Another theme could be the challenges they face in expressing their feelings for each other due to their respective personalities and the world they live in. And of course, the 'lemon' aspect might bring in themes of desire and longing between Naruto and Satsuki.