However, the character most closely associated with being Chuck's sidekick is Morgan Grimes.
Here's why:
* Loyal and Always There: Morgan was Chuck's best friend, a constant presence in his life, and always willing to help him, even in dangerous situations.
* Growing Competence: While initially portrayed as goofy and somewhat incompetent, Morgan gradually developed skills and became more capable, often providing valuable assistance to Chuck.
* Comic Relief: Morgan's comedic nature and often-bumbling personality served as a foil to Chuck's more serious nature, adding humor to the show.
While other characters like Casey and Sarah were also crucial allies, Morgan's role was more distinct as a constant companion and support system.