A young and curious human with a special gift, like the ability to see spirits, would also be a good pairing. Harlequin could take the human under his wing and show them the wonders of the fairy world, while the human could offer a fresh perspective on things that the Fairy King may not have considered before.
They could be described as iridescent, with a sheen that changes color depending on the angle of the light. For example, in the sunlight they might shimmer like a rainbow, adding to the Fairy King Harlequin's otherworldly appearance.
One idea could be the Fairy King Harlequin going on a quest to find a lost magical artifact that is crucial for the survival of his fairy realm. Another could be him forming an unlikely alliance with a mortal to face a common enemy that threatens both the fairy world and the human world.
A fanfiction could revolve around the origin of the Fairy King Harlequin's wings. It could explore how he got them, whether it was through a powerful spell, a gift from another magical being, or something more mysterious. For example, perhaps his wings were a result of a self - sacrifice he made long ago, and now they hold great significance in the fairy kingdom.
Kirby and Natsu would make a great pair. Natsu's fire - based magic and Kirby's ability to absorb and copy abilities could create some really cool combat combinations. They could both be hot - headed in their own ways and charge into battles without much hesitation.
Natsu could be a great character to pair with Kinana. He's adventurous and his warm personality could bring out different sides of Kinana. Also, Gray would be an interesting choice. His cool and sometimes aloof nature could contrast well with Kinana's more reserved self. And Erza, with her strong leadership and warrior spirit, could form a great partnership with Kinana in a fanfiction, perhaps teaching her some combat skills.
Lucy would also be a good pairing. She's intelligent and has a wide range of celestial spirits at her disposal. Sora could learn a lot from her about magic, and together they could use their different skills to solve mysteries or defeat enemies. Maybe Sora has some knowledge about the celestial world that Lucy doesn't, and they can share and grow together.
Juvia is an obvious choice. Their relationship in the original series is full of interesting dynamics. Juvia's over - the - top love for Gray can lead to many comical and heartwarming situations in fanfiction. Another good option is Natsu. Their friendly rivalry can be explored further, like having them team up against a powerful enemy they couldn't defeat alone.
Natsu would also be an interesting choice. Natsu's brash and impulsive nature could contrast well with Mystogan's more reserved and calculated personality. They could start off not getting along but then grow to respect each other during a difficult quest.
One popular King Harlequin crossover fanfiction is 'The Meeting of Kings'. It combines the unique elements of King Harlequin's world with another well - known fictional realm, creating a fascinating story of adventure and discovery.
Gray would be a great character to pair with them. Gray has a long - standing relationship with Natsu, and his ice magic contrasts well with both Natsu's fire and Juvia's water. Their interactions can add a lot of humor and depth to the story, like Gray constantly arguing with Natsu while also trying to work together with Juvia.