Main Characters:
* Garfield: The titular character, a lazy, sarcastic, and lasagna-loving orange cat.
* Jon Arbuckle: Garfield's owner, a kind-hearted but somewhat hapless man.
* Odie: Garfield's dog companion, a cheerful and friendly golden retriever.
* Nermal: A small, annoyingly cute kitten who is Garfield's rival.
Other Characters:
* Arlene: A beautiful cat who is Garfield's occasional love interest.
* Herman Post: A cynical, grumpy cat who is Garfield's neighbor.
* Liz: Jon's coworker and friend, often the object of Jon's affections.
* Doc Boy: A quirky veterinarian who treats Garfield and Odie.
* Bucky the Squirrel: A persistent, but ultimately unsuccessful, foe of Garfield.
* The Farmer: A gruff farmer who owns the farm where Garfield sometimes ventures.
* Happy: A friendly, if somewhat naive, cat who is a member of Garfield's group of friends.
* Wade: A cat who often ends up the target of Garfield's pranks.
Important Note: The specific characters and their roles can vary slightly depending on the specific Garfield media you're referring to (comics, TV shows, movies, etc.).