A common theme is friendship. They often start as acquaintances or even rivals and then grow to become good friends. For example, in many stories, they learn to trust each other in battle and that trust extends into their personal relationship.
A prevalent theme is the exploration of their different personalities. Thor is more of a traditional hero, while Valkyrie has her own unique set of values. Their love stories in fanfiction often deal with how they understand and complement each other. For example, Thor's strength combined with Valkyrie's cunning can make for an exciting dynamic in a story. Also, the theme of sacrifice for love might be present. They could be in a situation where one has to sacrifice something important for the other's well - being or for the greater good, and this tests their love.
One possible storyline could be that they are on a mission together when Valkyrie discovers she's pregnant. They then have to face an old enemy who wants to use the unborn child for some dark purpose. Thor is determined to protect Valkyrie and their future family at all costs.
Some fanfiction communities on social media platforms like Tumblr might also have 'thor and valkyrie love fanfiction'. People often share their works or recommend others. You can search using relevant tags like #thor #valkyrie #love #fanfiction to find some interesting reads.
There's also a fanfiction called 'The Bond between Thor and Valkyrie'. In this one, it delves deeper into their relationship. It starts with them having a bit of a rough start as they both have strong personalities. But as they face various challenges together, they start to understand and respect each other more, and eventually form a deep bond that goes beyond just being comrades.
One possible plot idea could be that they are in the middle of a battle, and in a moment of victory and adrenaline, they share a passionate kiss. It could be a turning point in their relationship, from comrades in arms to something more romantic.
Thor could develop into a more responsible and protective figure. His usual bravado might be tempered with the need to care for Valkyrie and the baby. He might become more in tune with his emotions and less impulsive in battle, as he now has a family to think about.
Well, Valkyrie in Thor: Ragnarok has a really interesting back story. She used to be a Valkyrie, which was like a super - important and powerful role in Asgard. When Hela showed up and basically wiped out most of the Valkyries, Valkyrie was left with a lot of trauma. She escaped and ended up on Sakaar. There, she became a bit of a loner, working for the Grandmaster. But deep down, she still had that Asgardian warrior in her, which Thor was able to bring back out.