Another theme could be trust and loyalty. Since Failsafe is an AI that the guardian might rely on, the fanfics could explore how that trust is built, maintained, or even broken. It could also look at how loyalty between them is tested, especially when difficult decisions have to be made, like sacrificing one for the other or choosing between different courses of action that could have far - reaching consequences.
Adventure and survival are likely themes. In the Destiny universe, there are always threats. So in these fanfics, the guardian and Failsafe might team up to face some great danger, like a new powerful enemy or a cataclysmic event. This would make for an exciting read as they use their unique abilities to get through tough situations.
One common theme is redemption. Often, the fallen are portrayed as having a chance to be redeemed through their interactions with the guardians. Another theme is cooperation, as they have to work together despite their differences. And of course, there's the theme of discovery, both in terms of learning about each other's cultures and abilities.
I'm not sure of specific 'failsafe x guardian destiny fanfic' off the top of my head. But you could also try reaching out to the Destiny fan community on Reddit or Discord. They are usually very helpful in pointing out great fanfics, and someone might be able to recommend a really good one in this particular pairing.
Alliance is also a theme. The idea of a Guardian and a Fallen teaming up against a greater threat, perhaps something that endangers both of their species. This can lead to some exciting adventure - type stories.
One common theme is the idea of redemption. The female fallen often has a past filled with actions that may be considered wrong, but through her relationship with the guardian, she finds a path to redemption. For example, she might have been involved in raids against the guardians before but now is fighting on their side.
Common themes include the power struggle. Female guardians may face challenges from within their own ranks or from external enemies who want to take their powers. Another is the theme of sacrifice. They might have to sacrifice personal relationships or their own well - being for the greater good. There's also the exploration of the different planets and areas in the Destiny world. A female guardian could be exploring a new, uncharted planet, facing unknown dangers and making new discoveries, which adds a sense of adventure to the fanfiction.
One common theme is self - discovery. As the reader interacts with the stranger, they often learn more about themselves. For example, in many fanfics, the reader might discover hidden strengths or weaknesses through their relationship with the stranger.
One common theme is adventure. Since they both exist in the Destiny 2 universe which is full of battles and exploration, many fanfics will have them embarking on dangerous quests together. Another theme is friendship. They might support each other and grow their bond through various challenges.
Another theme is power and responsibility. Both the avatar and the guardian have certain powers, and they must use them responsibly. In 'avatar guardian fanfic', this is often explored through different plotlines where they face moral dilemmas related to their powers. It can be as simple as deciding when to use their powers in a fight or a more complex situation like dealing with political power within the Avatar world.
A major theme in 'destiny twilight fanfic' is the exploration of power. In Destiny, there are various powerful weapons and abilities, and in Twilight, there are vampires and werewolves with their own unique powers. Fanfics often focus on how these powers would compare, combine or conflict. Also, the theme of identity is quite common. Characters may struggle with their new identities in this crossover world.
Power adaptation is also a theme. Naruto has his chakra-based powers, while Destiny has a wide range of powers like the use of Light and Dark, and different weapon types. In these fanfictions, Naruto usually has to figure out how to use or adapt to these new powers. For example, he might try to combine his Rasengan with the energy blasts in Destiny. And there's often the theme of heroism. Both Naruto and the characters in Destiny are often in situations where they need to be heroes, so in the fanfiction, it's about how Naruto fits into that hero - centric world of Destiny and vice versa.