Another place could be Wattpad. There are many fanfiction writers on there who might have written something about the Lannisters in the context of Game of Thrones. However, it may take some time to sift through the numerous works to find specifically what you're looking for regarding Taiwan and the Lannisters.
Some specialized Game of Thrones fan communities or forums might also be a good source. For example, Reddit has dedicated Game of Thrones sub -reddits where fans discuss and sometimes share their own fanfictions. You can post a query there asking about Lannister - related fanfictions with a Taiwan connection.
One possible plot idea could be a Lannister character traveling to Taiwan - like setting in the Game of Thrones world and having to adapt to a different culture and political landscape there. Maybe they form alliances or face new enemies.
If Naruto was a Lannister in a Game of Thrones fanfiction, he'd be a very different kind of Lannister. He'd probably use his ninja skills to protect the family in ways they've never seen before. Instead of the usual backstabbing, he might bring in a sense of loyalty and honor that the Lannisters lack. He could use his jutsu to make the Lannister stronghold more secure, like creating barriers with his earth - style jutsu.
I really liked 'Jaime Lannister: A Different Path'. In this fanfiction, Jaime decides to side with the Starks early on. It's an interesting take as it completely changes the course of his character in a believable way. There are some great character interactions that are not in the original show.
One great 'Game of Thrones Tywin Lannister Fanfiction' is 'The Lion's Legacy'. It delves deep into Tywin's past, showing his rise to power in a very detailed and engaging way. The author does an excellent job of portraying his complex personality.
Power is a very common theme. The Lannisters are known for their lust for power in the original series, and fanfictions often explore how they gain, maintain, or lose power. Family loyalty is another. Despite their many flaws, the Lannisters have a strong sense of family loyalty, and this is often a central theme in fanfictions.
There could be a fanfiction that focuses on an alternate universe where Tywin survives longer. In this story, he would have to deal with the changing political landscape after the events at King's Landing. He might try to regain control of the situation, perhaps by making alliances with unexpected parties. His character would be forced to adapt to new threats and challenges, which could lead to some very interesting plot developments.
Consider their upbringing. If they were raised away from the main Lannister stronghold, they might have a different set of values. Maybe they were raised by a kind - hearted servant who taught them to be more empathetic. So their personality could be a mix of Lannister pride and this new - found empathy. They could be conflicted between loyalty to their family and doing what is right according to their own conscience.
Perhaps an OC Lannister who is a talented healer. In a world full of wars and battles in Game of Thrones, a healer Lannister could be an interesting addition. They might have to deal with the moral dilemma of healing both their own family's enemies and allies. They could also have a secret love affair with a member of another house, which would add a layer of drama.
Some fanfictions have Jaime exploring the Free Cities. This is different from his usual Westerosi setting in the show. He gets involved in different cultures and politics there, which makes for an exciting read as we see how he adapts.
One of the main themes is family dynamics. The Lannisters have a complex family structure, and the OC has to find his place within it. Also, the theme of survival is prevalent. In the cut - throat world of Game of Thrones, the OC has to fight to stay alive and relevant. And then there's the theme of reputation, as the Lannister name comes with both advantages and burdens.