There's no way to tell without more information. But it might be a group of friends who are on an adventure together. They could each have their own distinct personalities and skills that help them along the way.
I'm not sure specifically what the 'roanhorse graphic novel book' is about as there could be many different stories within it. It could be about adventure, with characters going on a journey through strange lands. Maybe it has elements of mystery, like a detective trying to solve a complex case.
Well, without knowing the exact 'book 2 graphic novel', it's hard to say for sure. However, in a series, main characters often include the protagonist who drives the story forward, their sidekicks or allies, and sometimes the main antagonist. In a graphic novel, these characters are brought to life not just through words but also through the art, so their appearance and how they are drawn can also be important aspects of their character.
In the 'graphic novel Watchmen book', there's Ozymandias, a very intelligent and powerful character who has his own grand plans for the world. Silk Spectre is an important female character, adding a different perspective to the story. And of course, there's the Comedian, whose actions and views set in motion many of the events in the story. These characters all interact in complex ways that drive the plot forward.
I don't know for sure as I haven't read it. But usually in a series, the main characters from the first book might continue to be important in the second. So, there could be a heroic lead character, perhaps with some special abilities or a strong will.
The main characters are probably Mowgli, the boy raised in the jungle. Then there's Baloo, the friendly bear who teaches Mowgli a lot. Bagheera, the wise panther, is also likely to be a main character. And of course, Shere Khan, the menacing tiger, who is always a threat to Mowgli.
The main character is Bod, a boy who is raised in a graveyard. There are also various ghosts and other supernatural beings in the graveyard that play important roles in his life and the story.
In the Odyssey book graphic novel, Odysseus is the central figure. His adventures are the main focus. Another important character is Telemachus, his son. Telemachus plays a crucial role in the story as he tries to find his father and deal with the chaos at home. Also, Athena, the goddess, is a significant character. She often helps Odysseus on his journey.
I'm not sure as I haven't read it. But it could be a young adventurer, a wise old wizard, or a brave knight.
In 'book 1 of beowulf graphic novel', Beowulf is the central figure. He is a young and brave warrior. Alongside him, there could be his mentor, someone who has taught him the ways of war and honor. There might also be the local chieftain or king who gives Beowulf his first missions or tasks. And, of course, there could be the first foes he has to face, which are important in establishing the danger and the need for a hero like Beowulf in the story.
I'm not entirely sure without more context, but it might include characters from the previous 'wof' books. They could be the heroes or villains that have been central to the story so far.