The main character is Polo. He is the driving force behind all the adventures in the graphic novel. Besides Polo, there may be some antagonists, like a villain who tries to stop Polo from achieving his goals. There could also be characters like Polo's family members who are mentioned in flashbacks and might have influenced his decision to embark on these adventures.
In 'the adventures of polo graphic novel', Polo is the central figure. He's likely to be a brave and curious character. There could be other characters such as the inhabitants of the places he visits. For instance, a group of children in a village he stops at, or a tribe leader in a more primitive area. These characters interact with Polo and either help or hinder his adventures.
Obviously, Hercules is one of the main characters. He is the central figure around which the adventures revolve.
Probably the main character is the babysitter. Alongside, there could be a group of kids with distinct personalities. For example, there could be a curious and talkative child who always gets into trouble, and another one who is very quiet but observant. And there might be some neighbors or friends who pop up during the adventures and play important roles too.
I'm not familiar with the specific characters in this graphic novel. But thinking about typical adventure stories, if Zero is the protagonist, there may be characters that represent different aspects of the world Zero is in. There could be a powerful wizard or sorceress who gives Zero clues or tasks. There might also be a group of outcasts that Zero teams up with to fight against a common enemy or to achieve a common goal in the story.
Captain Haddock is also a key character. His drunken yet endearing personality and his loyalty to Tintin add a lot of humor and depth to the stories. For example, in many adventures, his antics and his knowledge of the sea are important elements. And Snowy, Tintin's dog, is always by his side. Snowy is not only a cute pet but also often helps Tintin in different situations, like sniffing out clues or warning him of danger.
Batman is surely one of the main characters. He's the central figure in most Batman - related stories. Robin might also be there, as he often teams up with Batman.
There are many main characters. Cyclops, with his optic blasts, is a key leader. Wolverine, of course, with his adamantium claws and healing factor. Jean Grey, who has powerful telepathic and telekinetic abilities. And Storm, who can control the weather. These are just a few of the central figures in the 'X Men Adventures Graphic Novel'.
The most prominent character is Sabrina Spellman. However, her aunts, Zelda and Hilda, are also key characters. They are much older and more experienced witches who help Sabrina understand her powers and her place in the witch world. Then there are characters like Harvey, who is Sabrina's love interest and is part of her normal mortal life, and various other witches and demons that Sabrina encounters during her adventures.
The main characters are Huckleberry Finn and Jim. Huck is a young boy who is trying to find his place in the world. Jim is a runaway slave who becomes Huck's friend and travel companion.
The main characters would be the JLA heroes. Superman with his super strength and flight, Batman with his intelligence and gadgets, Wonder Woman with her combat skills and magic items. They are the ones who will be driving the story forward, fighting against the villains and solving the problems in the graphic novel.
The main characters are George, Harold and Captain Underpants.