One great 'enemies to lovers' fantasy novel is 'A Court of Thorns and Roses' by Sarah J. Maas. It has a great build - up of the relationship between Feyre and Rhysand. Another is 'The Cruel Prince' by Holly Black. The dynamic between Jude and Cardan is full of tension and eventual love. Also, 'Shadow and Bone' by Leigh Bardugo has some elements of this trope as well.
One great enemies to lovers light novel is 'Red, White & Royal Blue'. It tells the story of a prince and the son of the US president who start off on the wrong foot but gradually fall in love. Another is 'The Hating Game', where two co - workers who constantly bicker realize they have deeper feelings for each other. 'Pride and Prejudice' can also be considered in a way, as Elizabeth and Mr. Darcy initially dislike each other due to pride and prejudice respectively, but then come to love one another.
Character growth is a key characteristic. The characters start off with negative views of each other. But as the story progresses, they learn to see past their differences. In 'Red, White & Royal Blue', the two main characters grow from being political rivals to lovers, and in the process, they become more understanding and empathetic.
'Aristotle and Dante Discover the Secrets of the Universe' can be considered in this category. Ari and Dante have a complex relationship at first. They don't understand each other but over time, they develop deep feelings for each other. It's a beautifully written novel about friendship evolving into love.
There's 'Outlander' by Diana Gabaldon. Claire and Jamie start off on a rather difficult footing. Claire is a time - traveler from the 20th century and Jamie is a Scottish Highlander in the 18th century. Their different backgrounds and initial misunderstandings create a sense of enmity, but soon enough, a passionate love story unfolds.
Character development is a big part. The characters have to change their initial negative views of each other. In a good 'enemies to lovers' BL novel, you'll see how they gradually start to understand and care for one another. For instance, they might discover shared traumas or interests that bridge the gap between them.
You could also check out 'Given'. Ritsuka and Mafuyu have some initial friction. Ritsuka is a bit cold towards Mafuyu at the start. But through their shared love for music, they grow closer and develop a deep, loving relationship.
The 'Shadow and Bone' trilogy by Leigh Bardugo has elements of enemies to lovers. Alina and the Darkling have a complex relationship. At first, Alina sees the Darkling as a powerful and somewhat menacing figure. But there's also an attraction between them. The Grishaverse setting, with its magic and different factions, makes their relationship journey even more interesting.
A good one is 'Devil in Winter' by Lisa Kleypas. Sebastian, Viscount St. Vincent, and Evie are sort of enemies in the beginning. Evie is in a difficult situation and Sebastian offers a rather self - serving solution which she initially resents. But as they are forced to be in each other's company, they grow closer and their relationship turns into a loving one. These novels are great because they show the development from animosity to love in a historical context, with all the social rules and expectations adding to the drama.
The slow - burn aspect is also important. These novels often take time to develop the relationship. The characters go from hating or disliking each other to gradually having feelings. It's not an instant love. In 'The Duke and I', Daphne and Simon's relationship evolves over time as they interact more and more, and their initial animosity fades away bit by bit.