Humor is also a big theme. Fred and George are known for their pranks and jokes, and the OCs usually get caught up in their humorous antics. The fanfictions often have lots of funny situations, like the OC accidentally being the target of a prank or joining in on a big joke on someone else. It makes the stories light - hearted and enjoyable to read.
In 'fred and george x oc fanfiction', the theme of acceptance is often present. The OC may be different in some way, and Fred and George accept her for who she is. Another theme is the power of teamwork. They work together on various things, whether it's creating new magical products or getting out of trouble. And love triangles can also be a theme in some of these fanfictions, adding an element of drama to the story.
There's also 'Fred, George and the Mysterious OC'. In this fanfic, the OC character has a special power that catches the twins' attention. The story is full of humor as the three of them get into all sorts of hilarious situations.
To make the OC stand out, give them a strong moral code that is different from the norm at Hogwarts. Maybe they believe in absolute non - violence in all situations, which would be quite unique in a school where hexes are sometimes used casually. Their family background can also play a role. If they come from a family of magical healers but they have a natural inclination towards chaos magic, it creates an interesting contrast. Also, their speech pattern can be unique. They could use archaic magical terms that no one else uses, making them seem like a walking magical encyclopedia.
One great 'fred and george x oc fanfiction' is 'The Twins' New Adventure'. It has an interesting plot where the OC, a shy but intelligent girl, gets involved in the twins' pranks and magical experiments. Another one is 'Love Among the Laughter' which focuses on the budding relationship between Fred and the OC in a very heartwarming way.
One reason could be that they played a particularly mischievous prank on her that went too far. For example, if they made her late for an important exam or meeting with a professor by using one of their wild magical inventions. Hermione, being a stickler for rules and academic achievement, might lose her temper and hex them in retaliation.
Well, a common plot is the OC having a secret that the twins accidentally discover. Maybe the OC is a Metamorphmagus and is trying to keep it under wraps, but the twins notice something strange and start investigating. This leads to a series of events where the three of them bond over the secret. Another plot could be that the OC is in a difficult situation, like being bullied by some Slytherins, and the twins come to their rescue. Then, a friendship and potentially more develops. There are also plots where the OC has a special mission or quest, and the twins join in to help, creating an adventure - filled story.
A characteristic is the playfulness. Since Fred and George are known for their pranks in the original series, this often carries over into the fanfiction. So, the kiss might happen in a really unexpected and fun situation. Like, they might be in the middle of a prank gone wrong or right and then suddenly share a kiss. Also, the fanfiction usually explores their individual personalities within the context of their relationship. For instance, Fred might be more impulsive when it comes to expressing his feelings, while George is more reserved. The kiss then becomes a way to show how they navigate these differences.
In some fanfictions, they could be seen as soulmates in a platonic sense. Their strong bonds of friendship and the adventures they share might be interpreted as a form of soulmate - like connection.