Maybe a civilian girl who is fascinated by Deidara's art. She's not a ninja, but she has a deep appreciation for beauty and creativity. She could see past Deidara's rough exterior and his dangerous lifestyle. Her innocence and his wild nature could be a great contrast in the love story.
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.
There's also a possibility that it's a healer in his village. She might have been the one to patch him up after battles. Over time, she gets to know the real Deidara behind the tough ninja exterior. Her gentle nature could contrast with his more brash and explosive personality, and this contrast could be what draws them together in a love story.
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.
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.
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.
Luffy from One Piece could be a great crossover character with Deidara. Luffy's carefree and adventurous nature would contrast with Deidara's more artistic and destructive tendencies. They could start off as enemies, with Deidara seeing Luffy as a target for his art, but then end up as reluctant allies when facing a common threat.
Rebekah could also be an option in a different take on the fanfiction. Their long - standing relationship as siblings could be transformed into a romantic one in a unique way. Rebekah has always cared deeply for Elijah, and this new aspect of their relationship could be explored during the pregnancy. It would add a layer of complexity and taboo to the story.