I really like 'Klaus and the Unlikely Companion'. In this fanfiction, the OC is a witch who crosses paths with Klaus. What makes it stand out is the way it portrays Klaus's vulnerability around the OC. It shows a different side of him that we don't often see in the show. The plot twists are also quite engaging.
The plot is crucial. It should be engaging and not just a rehash of the show's storylines. Maybe it could involve a new supernatural threat that Klaus and the OC have to face together. This gives an opportunity for character growth and development of their relationship. Additionally, the writing style matters. It should be easy to read and flow well, with good dialogue that captures the essence of the characters.
Another good one is 'A Wife for Klaus'. It focuses on how the OC, who is a strong and independent character, changes Klaus for the better. The story is filled with great dialogue and scenes that show their growing love and how they support each other in the dangerous world of the supernatural.
I'm not sure about a specific title that stands out above all others for TVD Klaus gay fanfic. However, if you search on platforms like Wattpad, you might come across some interesting ones. Some fanfics might focus on Klaus's character development as a gay vampire in relation to other characters from the show. You could also try looking at Tumblr blogs dedicated to Vampire Diaries fanfic. They often share and recommend good gay fanfics involving Klaus.
There are many interesting fanfictions on this topic. Some might focus on how they deal with the pregnancy in the dangerous world of vampires and werewolves. For example, they could be facing threats from other supernatural beings who see their unborn child as a threat or a powerful asset.
One great 'klaus mikaelson oc fanfiction' is 'The Hybrid's Heart'. It has an interesting original character who interacts with Klaus in a very unique way. The plot is full of twists and turns that keep you hooked from start to finish.
Another theme is protection. Given the dangerous nature of their world, protecting the unborn child from various threats is often a central plot point. Enemies might try to harm the baby because of its potential power or to get revenge on Caroline and Klaus.
One great Klaus and Elena fanfiction is 'The Bond Beyond Blood'. It explores a unique relationship between them where they have to team up against a common enemy. The story is filled with intense emotions and some great character development for both of them.
There's also 'The Unlikely Bond'. This fanfiction delves deep into how Caroline and Klaus might interact outside of the main plot of the show. It shows their different personalities clashing and then gradually coming together in a really engaging way. It's full of great dialogue and some really sweet moments between them.
One great Klaus and Rebekah fanfiction is 'The Sibling Bond'. It delves deep into their complex relationship, showing how they rely on each other through different trials in the supernatural world. It has some really interesting plot twists that keep you hooked.
There's a fanfiction called 'Klaus and Bella: An Unlikely Alliance'. This one is interesting because it starts from a point where Bella and Klaus are forced to work together. As they do, they start to understand each other more. The writer uses great descriptive language to show the changing emotions between the two characters over time.