* He learns and grows: Throughout the story, Greg experiences situations that challenge his perspective and force him to adapt. He starts the book with his usual focus on popularity and avoiding embarrassment. However, his experiences at the cabin, dealing with his family and new friends, lead him to see things differently.
* He demonstrates change: Greg's initial selfishness and attempts to manipulate others eventually give way to genuine concern for his family and friends. He even takes risks to help them, showing that he's capable of putting others before himself.
* He faces consequences: Greg's decisions, both good and bad, have consequences. His actions, even when driven by self-interest, lead him to learn from his mistakes and make better choices.
In contrast, a static character remains the same throughout the story, without significant internal change.
While Greg might still be considered "wimpy" in some ways, his growth and the changes he undergoes throughout Cabin Fever make him a dynamic character.