Start with a strong concept. It could be something like the OC being from another dimension and getting stuck in the Avengers' world. Then, build the story around that. Focus on the character development of both Thor and the OC. Let their relationship grow organically. Also, include some of the other Avengers to make it feel like a part of the whole universe. Write engaging dialogue and exciting action scenes to keep the readers hooked.
One great Thor x OC Avengers fanfiction is 'A New Ally'. It has an interesting plot where the OC has unique powers that catch Thor's attention. The story does a great job of integrating the OC into the Avengers' world.
Maybe an alien from a planet that was previously unmentioned in the MCU. This alien OC has a special connection to the power of the Infinity Stones and teams up with Thor because they realize that Thor is a key figure in the battle against Thanos. Their knowledge of the Stones could be crucial in the fight.
Love and redemption are also common themes. The OC might be a character with a troubled past, and Thor helps them find redemption. At the same time, they fall in love. It's a classic trope that gives an emotional depth to the relationship between the two characters. This can be seen in many 'Thor x OC fanfiction' where the OC has to overcome some personal demons with Thor's support.
One interesting concept could be how an original character (OC) interacts with Thor during the events of Infinity War. Maybe the OC has a unique power that helps Thor in his quest against Thanos, like being able to manipulate time briefly to give Thor an advantage in a battle.
Love triangles are also quite common. The OC is usually caught in the middle between Thor and Loki, creating a complex web of emotions and relationships. This adds a lot of drama and tension to the story, as the OC has to navigate her feelings for both characters. It can lead to some really interesting character development and plot twists.
One common theme is friendship. Often, the male OC and Thor start as acquaintances and develop a strong bond of friendship over time, facing various challenges together.
One great Thor and Avengers fanfiction is 'The Reunion'. It focuses on Thor's return to the Avengers after being away for a while. The story does a great job of showing his relationships with the other members, especially how he reconnects with Tony Stark after some previous tensions. It has some exciting battle scenes as well.
The appeal of Thor x OC Lemon fanfiction lies in the freedom it gives to explore new relationships. With an OC, the author can create a character that fits perfectly into Thor's story in ways that existing characters might not. It allows for unique storylines that can be tailored to different tastes.
One great 'Thor x OC fanfiction' is 'A New Beginning'. It has an interesting plot where the OC is a powerful mage from another realm who crosses paths with Thor. Their relationship develops as they face common enemies.