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'.
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'.
Since it's an 'after story' of 'Love Stage!', the main characters would be those who were central to the first story. Maybe the couple who fell in love in the initial story are the main focus here. They are the ones whose love story continues to unfold, with their unique personalities and backstories still playing important roles.
I don't have enough information to determine the main characters in 'After Earth Love Story'. It could be a man and a woman who are survivors in this post - Earth scenario.
Without having read the 'love is love graphic novel', it's difficult to say exactly who the main characters are. However, considering the theme of 'love is love', the main characters could include individuals who are in interracial relationships, same - sex relationships, or those who have overcome obstacles in their love lives due to family or cultural differences. These characters would then be used to tell stories that promote the idea that love is inclusive and should not be restricted.
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.
There are often soldiers. They've seen the horrors of war and are trying to find peace and love afterwards. And nurses. They took care of the wounded during the war and might fall in love with one of the soldiers they nursed. Also, civilians who survived the war and are looking to rebuild their lives with a new love.
Since the title mentions a duchess, she is likely to be one of the main characters. There might also be a male lead who is in love with the duchess.