Uma could be a great love interest. They already have a history together from the Isle. In Auradon, they could rekindle their relationship and face new challenges as a couple, like dealing with the differences between Auradon and the Isle's cultures.
A plot could revolve around Harry Hook trying to start a new pirate - like crew in Auradon. However, Auradon has different rules and values compared to the Isle. He has to find a way to adapt his pirate ways to fit in while still maintaining his own identity. He might face opposition from some Auradonians who don't trust his motives, but also gain some supporters who are intrigued by his adventurous spirit.
Irene Adler could be a great love interest. She's smart, cunning, and was able to outwit Sherlock once. Their relationship in the original stories had a certain tension that could be developed into a full - blown love story in a fanfiction. She challenges him and has her own secrets, which could make for an exciting dynamic.
Sasori could be an interesting love interest. They are both from Akatsuki and have a certain connection through their art, though Sasori's is more in the form of puppets and Deidara's is explosive art. Their different personalities could create a lot of tension and a unique love story.
A foreign ninja from another village might also work well. This ninja could bring a different perspective to Kabuto's world. They could meet during a diplomatic mission or a joint training exercise between villages. Their love would be a bit more challenging as they have to deal with the politics between their respective villages, but it would add an interesting layer to the fanfiction.
A strong - willed priestess could be a great love interest. She could be the one who interprets the gods' will and at first is hesitant about Hercules due to his half - god status, but then falls for his heroism.
It could be a random stranger he meets at a Vegas nightclub. Maybe she's a singer or a dancer there.
A fellow Gryffindor Quidditch player would be a great love interest. They already share the passion for the sport and the house pride. They would understand Oliver's dedication to Quidditch and support his dreams. Another option could be a girl from Hufflepuff who is kind - hearted and loves to watch Quidditch. She could bring out Oliver's softer side. Or a Ravenclaw who is really smart and helps Oliver with strategies for his team, and they fall in love over their shared interest in making the Gryffindor Quidditch team better.
A historian would be a great love interest. She could be researching the events of his time and be fascinated by his story. Thackery, in turn, would be intrigued by her knowledge of his past and they could form a connection based on that shared interest.
A strong female werewolf from another pack could be a great love interest. She could bring a different perspective to Derek's world and they could bond over their shared werewolf experiences. Their relationship could be about uniting their packs in the end.
Another option could be a fellow 'dark' character. Let's say a female vampire who is also used to being feared and alone. They could meet in the shadows of the night and initially be wary of each other. But as they discover their similarities, like their thirst for something (Jeff for bloodlust and the vampire for blood), they start to form a bond that turns into a romantic relationship.