A really engaging Issei Merlin fanfiction is 'Merlin's Guidance for Issei'. Here, Merlin takes on the role of Issei's mentor. The story delves into how Merlin helps Issei grow in strength and wisdom. It has detailed descriptions of their training sessions and the bond that forms between them.
There's a fanfiction called 'Issei's Encounter with Merlin'. In this one, Issei meets Merlin in a magical forest. The author does a great job of portraying Merlin's mysterious nature and Issei's reaction to it. It also has some unique magical elements that make it stand out.
One great Merlin reincarnation fanfiction is 'The Return of Merlin'. It has an interesting plot where Merlin is reincarnated in a modern world but still has his magic. The story does a great job of exploring how he adapts to this new environment while trying to keep his powers a secret.
One great Merlin Christmas fanfiction is 'A Magical Christmas at Camelot'. It shows Merlin using his magic to bring a touch of real Christmas spirit to the usually dour Camelot. The knights are charmed by the idea of Christmas trees and gifts.
I really like the fanfiction 'Iron Man's Apprentice: Issei'. In this one, Issei is sort of taken under Iron Man's wing. It shows how Issei adapts to the new technology and also how his character develops with the influence of Tony Stark. There are some amazing fight scenes where Issei uses his new - found skills and tech to fight against the villains from both universes.
There's a fanfiction titled 'Female Ddraig's Encounter with Issei'. In this, the author delves deep into how a female Ddraig would view Issei. It's full of character development and new scenarios that are quite different from the canon. For example, their conversations are more nuanced as the gender change of Ddraig affects her perspective on Issei.
One interesting Issei Crossover Fate fanfiction could be 'Issei in the Fate World'. In this story, Issei is transported to the Fate universe and has to adapt to its rules and magic system. He might form new alliances and face off against powerful Servants. Another good one could be where he teams up with Shirou to fight a common enemy that threatens both their worlds.
There is a fanfic called 'Issei's Human Ascent'. In this story, Issei decides to fully embrace his humanity and rejects the more violent and power - hungry aspects of the supernatural world. It has some really interesting character development as he struggles to maintain his newfound human - only identity. There are also some great fight scenes where he uses his wits instead of brute strength.
One great Arthur Merlin Assassin fanfiction is 'The Hidden Blade'. It weaves a thrilling plot where Merlin uses his magic subtly in the role of an assassin to protect Arthur. The story has great character development and keeps you on the edge of your seat with its action scenes.
One great 'Female Merlin and Leon' fanfiction is 'The Enchanted Bond'. It beautifully portrays their relationship in a magical world filled with adventure. The author does an excellent job of developing their characters in a way that stays true to the original spirit of the Merlin series while adding a fresh twist with Merlin being female.
One great 'Merlin' and 'Vampire Diaries' fanfiction is 'The Crossover Chronicles'. It combines the magic of Merlin's world with the vampiric allure of 'Vampire Diaries'. The author does an amazing job of bringing characters from both universes together in a believable way. Another one to check out is 'Merlin in Mystic Falls' which has Merlin arriving in the town of Mystic Falls and getting involved in all the supernatural drama there.
One great Merlin sword fighting fanfiction is 'The Battle of Camelot's Blade'. It really delves into Merlin's hidden skills and his strategic use of magic during sword fights. Another is 'Merlin's Duel Destiny' which shows an alternate universe where Merlin has to fight more openly with his sword against dark forces. And 'Sword and Sorcery: Merlin's Way' combines his swordsmanship with his growing understanding of magic in a really exciting way.