|The following is a list of main and recurring characters in the Oswald series.
- Oswald is a kind blue octopus. He is voiced by Fred Savage.
- Weenie is Oswald's pet hot dog. She is voiced by Debi Derryberry.
- Henry is an uptight penguin. He is voiced by David Lander.
- Daisy is a fun-loving flower. She is voiced by Crystal Scales.
- Madame Butterfly is the owner of the Big Diner. She is voiced by Laraine Newman.
- Catrina is Madame Butterfly's daughter, a curious caterpillar. She is voiced by Debi Derryberry.
- Johnny Snowman is the owner of a local ice cream shop. He is voiced by Mel Winkler.
- Egbert and Leo are two identical twin eggs. They are voiced by Daran Norris and Grant Albrecht, respectively.