There's a fanfiction called 'Thranduil's Encounter with the Dragon King'. In this story, Thranduil has to face a powerful dragon king and the interactions between them are full of tension and mystery. There are also some stories on fanfiction.net that are really good, you can search there using the tags 'Thranduil' and 'dragon' to find more.
Well, 'Thranduil and the Dragon's Lair' is a fanfiction that shows Thranduil bravely entering a dragon's lair. It details his journey inside, his thoughts, and how he deals with the dragon. The author does a great job of describing the dragon and Thranduil's character, making it an exciting read.
Another place to look is Archive of Our Own (AO3). There are a lot of talented writers in the Tolkien fandom there. A good fanfiction might involve Thranduil having to protect his people from a dragon's fire. Maybe the dragon has been awakened by some dark magic and Thranduil is the only one who can stop it. The fanfiction could explore his character development as he overcomes this great threat.
One popular female Thranduil fanfiction is 'The Lady of the Woodland Realm'. It explores a female version of Thranduil in a world filled with political intrigue and magical quests. Another is 'Thranduil's Daughter' which delves into the life of a female character related to Thranduil and her own adventures in Middle - earth. There's also 'A Female Thranduil's Journey' which focuses on a female Thranduil's struggle to protect her realm against various threats.
Well, there's 'Love Beyond Species: Thranduil and the Human'. This fanfiction focuses on the relationship that develops between Thranduil and a human character. It's interesting as it explores how their different natures interact. Also, 'The Human in Thranduil's Court' is a good read. It shows how a human adapts to the elven court life under Thranduil's rule.
One popular Thranduil crossover fanfiction is 'Thranduil in the Modern World'. It imagines Thranduil being transported to our modern era and his interactions with modern humans. It's really interesting to see how his elven ways clash and sometimes blend with our contemporary culture.
There's also 'Thranduil and the Lost Soul'. In this fanfiction, an OC who is a lost soul finds their way into Thranduil's domain. The story delves deep into the lore of the elves and how Thranduil deals with this unexpected visitor. It's a great read if you like stories that explore different cultures within Middle - earth.
One great Harry and Thranduil fanfiction is 'The Meeting of Two Worlds'. It explores an alternate universe where Harry somehow ends up in Thranduil's realm. The story beautifully weaves the magic of the Harry Potter universe with the elven world of Thranduil. It has some really interesting character interactions, especially when Harry tries to understand the elven culture.
I'm not sure which specific 'Thranduil lemon fanfiction' is good as it often involves non - canonical and sometimes not - so - mainstream interpretations. However, you can try looking on fanfiction - dedicated websites like Archive of Our Own. Just search for 'Thranduil' in the search bar and browse through the results to find stories that might interest you.
I also like 'Thranduil's Unforeseen Love'. This fanfiction takes an interesting approach where Thranduil falls for a human who has come to seek his help. It explores the difficulties of their relationship due to the differences between elves and humans, but also the power of love that overcomes them.
One popular 'thranduil x bilbo fanfiction' is 'A Chance Encounter'. It beautifully weaves a story of their unexpected meetings and the gradual development of their relationship. The descriptions of Middle - earth in it are quite vivid, making the reading experience immersive.
One great piece of fanfiction could be 'The Bond Between Father and Son'. It beautifully explores the relationship between Legolas and Thranduil. It shows their interactions in the Elven realm, with Legolas learning from his father's wisdom.