Another theme is friendship. For example, George has a relationship with the Man in the Yellow Hat, which shows loyalty and care between them. Also, there is a sense of discovery in these stories. George discovers new things about the world around him, whether it's in the city or in the jungle. It's like kids learning about the world through his adventures.
In some of the stories, the animals that George meets in the jungle can also be considered popular. For instance, the elephants or the birds. They add more fun and adventure to the story when they interact with George.
Probably not without permission. Since 'Curious George' is a popular brand, the owners of the rights to this name are likely to protect it. If you want to use the name, you should contact the copyright holders and ask for their consent. Otherwise, you may face legal issues.
It's not a good idea. 'Curious George' is a well-known and potentially copyrighted character. You could face legal consequences if you use the name without proper authorization. It's better to come up with an original name for your novel.
For a school assignment, it might be okay as long as it's for educational purposes. Usually, educational uses are more lenient when it comes to copyright. But it's still a good idea to check with your teacher if there are any concerns about using a copyrighted name.