Jonah is a black cat who once brought bad luck to Garfield.
Jonah was once portrayed as being depressed, due to being dumped by his girlfriend Mindy. He therefore causes bad luck to people and animals whose paths he crosses. Garfield breaks this curse by slipping on a banana peel, making Jonah laugh and get back together with his girlfriend.
- "Online Arbuckle" (cameo)
- He has the same body shape as Myron.