If you're looking for anime similar to Bucket de Gohan, you might like these titles.
Mike is a penguin soldier who returns home after being injured during combat. Estranged from his family and friends, he leaves his hometown and starts to roam adrift through the country.
Scamper is a penguin who loves to explore. With his friend Snowflake, he has wonderful adventures. Together they discover the wonders of their world from a puppy called Cowboy and his owner, a scientist who is studing the Antarctic environment. They also discover, when they get stranded far from home, that not everything in their world is friendly. Yet with luck and the brave Scamper in the lead anything can happen.
In the United States of Antarctica, penguins have lives just like humans; they even have their own Congress. Members of "Congress penguins" discuss and debate over various funny issues all day long, with few meaningful results or resolutions.