Adventure is also a common theme. The characters from both Naruto and Equestria are often put into new situations and have to go on quests. They might be exploring new lands that combine elements of both universes, or they could be on a mission to save one of the two worlds from a threat that somehow links the two. For instance, a dark force that is affecting both the ninja world and Equestria.
There's also 'Equestria's Ninja'. This fanfic has elements where the ponies in Equestria start to learn about Naruto's ninja ways. They incorporate some of the ninja techniques into their own magic - based skills. It shows how two very different worlds can blend and influence each other in a creative way.
Another often - seen pairing is Sakura and Twilight Sparkle. Sakura is a strong - willed and intelligent character in Naruto, and Twilight is the same in Equestria Girls. They could bond over their love for knowledge, with Sakura sharing her medical ninjutsu knowledge and Twilight sharing her magical research. Also, they could support each other in facing challenges that require both physical and magical skills.
One possibility could be a character who has a deep understanding of magic and uses it to help the ponies in Equestria. This person might have studied magic from a different realm and brings unique spells and techniques to solve problems in Equestria.
In the context of Equestria fanfiction, 'best human in equestria' might be about a human who has the best relationships with the ponies or other creatures in Equestria. For example, they could be the one who understands the pony culture the most, or they are the most helpful to the Equestrian society. It could also be a character who has overcome the most challenges while being in Equestria, thus being regarded as the 'best'.
Friendship growth is also a big theme. They start out as just acquaintances or friends with some misunderstandings, but through various events in the fanfictions, they develop a deeper and more meaningful relationship.
In 'equestria girls flatulence fanfiction', it could be that some fans are exploring the more comical and less serious aspects of the characters. Maybe it's about imagining how the characters would react in embarrassing or funny situations involving flatulence. It's a bit of a strange concept but in the realm of fanfiction, people can take the characters in all sorts of wild directions for the sake of entertainment.
One common theme is friendship. Just like in their original stories, Sonic and the Equestria Girls often form new friendships or strengthen existing ones. They learn to work together despite their differences.
In many 'human in equestria romance fanfiction', Discord is an interesting character. His chaotic nature and his ability to change reality can make for some wild and exciting romantic storylines with a human. Applejack is also popular. Her strong work ethic and loyalty can be appealing in a relationship with a human. And Rarity, with her sense of style and elegance, can bring a touch of glamour to a human - equestrian romance.
One great trope is the 'fish out of water' scenario. The main character from Equestria suddenly finding themselves in a human world and building a harem can lead to some really interesting and comical situations. For example, they might misunderstand human customs which then endears them to the other characters in the harem.