Love can be a theme too, but not always in a romantic way. It could be a love for the world they are trying to save or a love for their friends. Sometimes, if it is romantic, it shows how their relationship develops in the context of the story's events, like how they support each other during a time of war or crisis in their fictional world.
One common theme is adventure. The OC often joins Noctis on his travels and they face various challenges together. For example, they might battle powerful monsters or explore uncharted lands.
One common theme is friendship. Given that Cloud and Noctis are both strong and complex characters, many fanfics explore how they could form a deep bond with each other.
Power and leadership are often themes. A female Noctis might face different challenges in terms of leading her group. Also, the theme of identity can be explored, as she might have a different sense of self in a world that might have different expectations for a female leader. In some fanfics, she has to prove herself more than a male Noctis would. And she may also have to deal with the reactions of those around her to her being a female in a traditionally male - dominated role.
One common theme is loyalty. In many fanfics, Noctis and Ignis are shown to be extremely loyal to each other, no matter what challenges they face. For example, in some stories, Ignis will go to great lengths to protect Noctis.
One common theme is heroism. Since Cor Leonis is a heroic character, many fanfics focus on his brave acts at night. Another could be mystery, as the night often adds an element of mystery to the story.
One common theme is the clash of different worlds. When Noctis crosses over into another universe, there's often a struggle to understand the new rules, cultures, and powers. For example, if he crosses into a sci - fi world, he has to figure out how to deal with advanced technology instead of his usual magic. Another theme is friendship. He might form new alliances with characters from the other universe, like in a crossover with the Dragon Age series where he could team up with the Inquisitor.
Friendship is a very common theme. Their bond in the game is strong, and in fanfiction it's often explored more deeply, like how they support each other through tough times. Another theme is adventure. Writers like to send them on new quests and adventures that expand on the world of the game.
Fate is also a big theme. They are fated to be together in some ways, and many fanfictions explore how they come to terms with this fate. Some also deal with the theme of separation. The fact that they are often apart in the original story leads to many fanfictions exploring the pain and longing of being separated.
One common theme is the exploration of gender roles. When Noctis is female, it allows for a different take on how she interacts with the male - dominated world of the game. For example, how she might face different challenges or be treated differently in a chauvinistic society within the story's universe.
A common theme is his physical vulnerability. Since Noctis is often in dangerous situations in the game, fanfics may expand on that, like him getting seriously wounded in a fight with a powerful enemy. Another theme is emotional hurt, such as his feelings of isolation as he bears the heavy burden of his destiny.
One common theme is friendship. Since there are three OCs, their relationships with each other often form a big part of the story, like in 'The Trio's Friendship' where they rely on each other through thick and thin.