One popular trope could be the 'mentor - mentee' trope, with Bast as the mentor to Carter. Since Bast has more knowledge and experience, she can teach Carter a great deal about his powers and the world of Egyptian mythology.
The 'unlikely allies' trope might also be used. Despite their differences in nature (a human and a goddess), they are forced to work together to achieve a common goal, like saving the world from a dark magic threat. This trope allows for interesting character dynamics and development.
Another possible trope is the 'fish - out - of - water' trope for Carter. When he is with Bast, he is constantly in a world that is both familiar (because of his connection to Egyptian magic) and strange (because of Bast's otherworldly nature). This can lead to humorous and thought - provoking situations in fanfictions.
There could be various fanfictions involving Carter and Bast. Maybe some explore their adventures in a modern world where magic still exists. For example, they might team up to solve a mystery that involves both Egyptian mythology and modern technology.
Sure. The 'fish out of water' trope can be seen in some Rosekiller fanfiction. For instance, if Rose is from a different place or dimension and has to adapt to Killer's world. Also, the 'redemption' trope can be applied, where Killer has a dark past and Rose helps him to become a better person.
Sure, there are several. The 'omegaverse' trope has made its way into dekubowl fanfiction at times, although it's a bit more niche. In a more common vein, the 'fish - out - of - water' trope can be found. This is when Deku is put in a situation that he's not used to, like in a different social setting or a new type of hero mission, and his relationship with another character blossoms from there. Additionally, the 'found family' trope is popular. Here, Deku forms a very close bond with another character or a group of characters that is like a family, which can have elements of both platonic and romantic undertones depending on how the author writes it.
In many harem fanfictions, including potentially those with a 'Johnny Harem Lemon' theme, there might be the 'jealousy' trope. Where the members of the harem get jealous of each other's interactions with Johnny. Also, the 'protective harem' trope could be present, where they all try to protect Johnny from various threats. However, the 'Lemon' aspect might add some more mature takes on these tropes, such as more adult - themed jealous scenes, but this is speculation as it's a rather specific type of fanfiction.
One popular trope could be the mentor - mentee relationship. As mentioned before, Tsume could be a mentor to Naruto, teaching him things that others can't. Another trope might be the unlikely friendship. Given their different clans and personalities, their friendship could be an interesting story to tell.
The 'redemption' trope could also play a part. Maybe Percy has to redeem himself in some way to be worthy of dating Hestia, or perhaps Hestia has to make amends in the eyes of others for choosing to be with Percy. This can add depth to the relationship and the overall story.
One popular trope is the 'fish out of water' situation. Since they are from different game worlds, when they are thrust into each other's world or a new world together, they have to figure out how things work. For example, Link might be confused by the advanced technology in Cloud's world, and Cloud could be baffled by the magic and creatures in Link's Hyrule.
One popular trope could be the 'rescue' trope, where Alibaba saves the reader in a dangerous situation. It adds an element of heroism to the relationship.
One common trope could be the 'overprotective partner' trope. Luther, being the strong one, might be overly protective of Allison during her pregnancy. Another could be the 'unexpected pregnancy' trope, which could lead to a lot of drama and character development.
There are likely some out there. However, the 'lemon' aspect might make it a bit harder to find exactly what you want. You can also try reaching out to other 'Kane Chronicles' fans on social media platforms and ask if they know of any good 'Bast' fanfictions with those characteristics. Just be polite and respectful when asking, as some people might not be into that type of content.