One potential love interest could be a half - elf. They would bring a unique blend of both elven and human qualities, which might intrigue Thranduil. Or it could be a nature spirit. Since Thranduil has a strong connection to the forest, a nature spirit who embodies the essence of the forest could be a fascinating match for him. Also, a powerful sorceress from a far - off land might be his love interest, with her magic and mystery attracting him.
A simple elven maiden from his own court could be his love interest. She might have been by his side all along, but he only realizes his feelings over time. Another option is an outcast elf. Thranduil, being a king, might be drawn to someone who has been shunned by society and wants to help and protect them. And perhaps a foreign diplomat from another elven kingdom, with their different views and charm, could capture Thranduil's heart.
His love interest could be Wendy's sister. In some fanfictions, a sister of Wendy who was always a bit more curious about Neverland than Wendy herself could be the one Peter Pan falls for. She might be more daring and willing to fully embrace the wildness of Neverland, which attracts Peter.
It could be Lillie. She is kind - hearted and has a deep connection with Pokémon. She and Ash have had many adventures together in Alola already. Her gentle nature and her growth throughout the series could make her a great love interest for Ash.
One possibility could be a young girl who accidentally stumbles into his realm. She might be different from others, with a kind heart that catches Slender Man's attention. Maybe she's not afraid of him at first sight, which intrigues him.
A strong female Autobot would be a great love interest. They already share the same values and goals, and the bond of being on the same side in the fight against the Decepticons could easily turn into a deeper emotional connection.
A possible love interest could be another Autobot. Maybe a female Autobot with whom he has fought side by side for a long time and gradually developed feelings for. Another option could be a human female who has shown great courage and understanding, and through their interactions, Optimus Prime finds himself attracted to her.
His love interest could be Whis. Although Whis is his attendant, they have a very close relationship. Whis is always by Beerus' side, guiding him and sometimes scolding him gently. Their dynamic could easily develop into a romantic one, with Whis' calm and intelligent nature complementing Beerus' more impulsive side.
A mortal could also be a good love interest. Imagine Nico, who has been so involved in the world of gods and demigods, falling for a normal human. This mortal could be an artist or a scientist, someone who sees the world in a completely different way than Nico. Their relationship could be about Nico learning about the mortal world through this person's eyes and falling in love with both the person and the new perspective.
A Beauxbatons student could be his love interest. Maybe a confident and intelligent witch who is at the top of her class in Beauxbatons. She could initially be put off by Draco's Slytherin reputation but then sees his softer side. Another option could be a half - blood student at Beauxbatons who is an outcast among the pure - blood - dominated school. Draco, being a Slytherin from a pure - blood family, could be drawn to her uniqueness.
Well, the 'enemies to lovers' trope can be quite common. Thranduil could initially dislike someone who then turns out to be his love interest. For example, if it's a character from a group that has had past conflicts with his people. Also, the 'reformed bad boy' trope might work. Thranduil might be seen as cold or aloof, but through the power of love, he softens and becomes a better version of himself. And there's the 'fated love' trope, as if the stars have aligned for them to be together.
Another possibility is Kyosuke. In the original story, Madoka had some feelings for him. In this fanfiction, they could explore a deeper romantic connection, perhaps with some twists and turns that are different from the original plot.