I don't know for sure since I haven't read it. But it could be the zookeepers, as they are often central to the operations in a zoo. There might also be certain animals that play major roles, like an old and wise elephant or a mischievous monkey.
The main characters in 'zoo the graphic novel' could be a diverse group. There could be a head zookeeper who is responsible for the overall management of the zoo. He or she might be a very dedicated person with a lot of knowledge about animals. Then there could be some of the more popular animals as characters, like a beautiful peacock that struts around the zoo, attracting the attention of both visitors and other animals. There may also be a young and enthusiastic zookeeper in training who is learning the ropes and having various encounters with the animals.
Since I don't know the exact 'zoo graphic novel', the main characters could be the animals like a curious monkey, a wise old owl, or a majestic lion. They could be the ones driving the story forward with their actions and personalities.
There might be a young explorer who ventures into the monster zoo and becomes one of the main characters. He or she could be on a quest to discover a rare monster or uncover some secrets about the zoo. And of course, there could be some interesting monster characters themselves that play important roles.
The main characters in 'The Zoo Story' are Jerry and Peter.
Since I don't know the exact 'Star Zoo Story', it could have characters like a zookeeper who is in charge of the star zoo. Maybe an adventurous visitor who stumbles upon this unique place.
It could be the new animals at the zoo. For example, if it's about a new baby elephant, the baby elephant could be a main character.
The main characters could be the animals themselves. Maybe there's a curious little monkey or a majestic lion that stands out in the story.
The main characters in a day at the zoo story can be diverse. There are the excited children who run from one exhibit to another, their parents who try to keep up and teach them about the animals. The zookeepers, who are like the guardians of the zoo world, are important too. And not to forget the animals, which range from the majestic elephants to the tiny insects in the insectarium. Each of these characters contributes to the overall narrative of the day at the zoo.
The main characters are Jerry and Peter. Jerry is a rather strange and lonely man, and Peter is a more middle - class, ordinary - seeming man.
The zookeepers are surely main characters. They are the ones responsible for feeding the animals.
The main characters could be the animals in the zoo. They are the focus of the story as it is set at the zoo.