Heathcliff is the central figure in the novel. He has a deep connection with Catherine Earnshaw. His character represents the idea of the outcast and the power of love and hatred. He is initially a poor and ragged boy who is taken in, but as the story progresses, his feelings of being wronged lead to a series of events that are full of drama and tragedy.
Heathcliff is the central character in the classic novel. He is a complex and brooding figure. He was an orphan brought to live at Wuthering Heights. His relationship with Catherine Earnshaw is at the heart of the story, and his experiences of love, rejection, and revenge shape the narrative.
The significance of Heathcliff lies in his being a symbol of the outsider. He was not born into the same social class as the Earnshaws, yet he falls in love with Catherine. His love and subsequent hatred due to the rejections he faces are central to the themes of the novel like love, class, and revenge. His actions throughout the story show how one's experiences can shape their character and actions in extreme ways.
Heathcliff is happy at the end perhaps because he gains a new perspective on life, or maybe he finally fulfills a deep longing that has haunted him throughout the story.
One of the main themes is love and revenge. Heathcliff's love for Catherine is intense but unfulfilled, which drives him to seek revenge on those who he believes have wronged him. Another theme is social class. Heathcliff is an outsider due to his low social status, and this affects his relationships and his place in society.
You might love Heathcliff because of his intense passion. He loves Catherine so deeply that it's almost primal. His complex character, full of both good and bad qualities, makes him very interesting.
Furthermore, the visual and thematic differences between them can be appealing. For instance, if they are in a fanfic set in a new world that combines elements of their original stories, the way they adapt to this new environment and each other can be really engaging. Their different skillsets, be it combat - related or otherwise, can also be used in interesting ways to drive the story forward and create unexpected twists and turns.
I'm not sure specifically about 'heathcliff x asuna' fanfic. However, you can start by looking on popular fanfic websites like Archive of Our Own. Just search for the characters' names, and you might find some interesting stories written by fans.