Most likely Batman and the Joker. Since it's about the Joker's actions in relation to 'death of the family', Batman would be the main hero trying to stop him.
The main characters would surely be the Joker, as the title implies he's central to the story. And Batman, because he's always in the middle of any major conflict involving the Joker. There might also be other members of the Bat - family like Robin or Nightwing, as they are often targets of the Joker's evil plans.
Batman and the Joker are the two most prominent characters. Batman is the hero trying to protect his family, and the Joker is the villain out to destroy it.
I'm not sure specifically as I haven't read the exact graphic novel. But generally, in a story about death in the family, there would be family members like parents, children, and maybe siblings. There could be a central character who is most affected by the death, perhaps a child who loses a parent and has to deal with the new reality.
I'm not sure as I haven't read it, but it could be the family members directly affected by the death. Maybe a grieving mother, a confused child, or a stoic father.
In the 'Joker 2008 Graphic Novel', the Joker is the central character. He is likely to interact with other well - known characters from the DC universe. This could include Commissioner Gordon, who often has a role in stories involving the Joker. There may also be some original characters created specifically for this graphic novel to add new dimensions to the story.
The main characters are Batman and Robin (Jason Todd). Of course, there are other characters in the Gotham universe that are involved in the story too, like the Joker who plays a major villainous role in this story.
In the 'Batman: Death in the Family' graphic novel, the key characters are Batman, who is on a mission to protect Gotham but fails to save Jason Todd. Jason Todd, the young and somewhat rebellious Robin, is a major part of the story. His relationship with Batman was complex. And then there's the Joker, the chaotic and evil villain whose actions drive the whole tragic plot forward.
It's a story that likely involves the Joker in some sort of dark and perhaps deadly plot within the context of a graphic novel. Usually, the Joker is known for his chaos and mayhem, so this might be about his actions that lead to a lot of destruction or death in the Batman universe.
The main character is likely the Joker himself. He's the central figure in most of his storylines.
The main characters are Batman and the Joker. Batman is a vigilante who fights crime in Gotham City. The Joker is his arch - nemesis, a chaotic and unpredictable criminal.
The main character is obviously the Joker. He is the central focus of the story, driving the plot forward with his chaotic and unpredictable actions.