It could be that there are multiple main characters. For instance, there might be a group of friends where two of them end up falling in love. In this case, all the friends could be considered main characters as they influence the love story in different ways. Their personalities and relationships with each other play important roles in how the love story unfolds.
I'm not sure as I haven't read the novel specifically. But usually, there would be a protagonist who is likely to be involved in the central love story. There might also be a love interest, perhaps a best friend or a family member who plays an important role in the character's journey of love.
Often there are characters who are directly affected by the mystery. For example, if the mystery involves a missing heirloom, the family members who own the heirloom would be main characters. They would be the ones with the most at stake and would be involved in the search or investigation in some way.
I'm not sure, as I haven't read it specifically. But usually there's a detective.
One key character is the one who has a high - ranking Sequence. He has a lot of influence in the story's world. There are also some characters who act as the protagonist's allies or opponents at different times. For instance, the female characters who have their own stories and contribute to the overall plot. The interactions between these characters are what drive the story forward.
There is no way to know for sure without reading the 'love is love novel'. But in many novels with this theme, the main characters could include those who are trying to redefine love for themselves. Maybe there are characters who have been hurt in the past and are now finding a new kind of love that they never thought possible. They could be the ones who drive the story forward by their journey in understanding and experiencing 'love is love'.
I'm not sure specifically as there is not much information given. But it could be a young couple, like a man and a woman in their twenties, who are trying to find their place in the world while falling in love.
There is also usually a female lead. She could be strong - willed, like a journalist who is determined to expose the truth no matter what. Their different personalities create the spark in the story.
As I don't know which '1969 love novel' it is, I can't say for sure who the main characters are.
There could be a male lead who is charming and somewhat naive in the ways of love at the start. And a female lead who is strong - willed and perhaps a bit guarded. Then there may be secondary characters like a wise old mentor figure who gives advice on love to the main characters.
Another character could be an ex - lover. Their presence, either physically or in the main character's memories, could be a significant factor in the story. The main character may have to come to terms with their past relationship with this ex - lover in order to fully embrace the new love. This character can add a lot of complexity and emotional turmoil to the plot of the 'love after love novel'.