If you're looking for manga similar to Masashi Sada: Penguin Minna Kyoudai 2020, you might like these titles.
A comedic manga series about a penguin named Beckham Kinoshita who attends Kirikabu Elementary School and likes to eat hamburgers and hot chips.
Three penguins who got into the human society. Work part-time for food delivery on a tricycle, or give up microphones to each other at karaoke. A loose manga about penguins who live at their own pace and humans who are swayed by them!!
In a certain secret bar, the “Penguin Gentlemen” work, wearing their long tailed tuxedos. “You say it's cute how penguins waddle around? Hmph. We're not just cute! We're dandy, sexy, and marvelous!”
Harry is a hedgehog who wants to be hugged. Garu is a wolf who looks intimidating but has a kind heart. Peta is a penguin who wants to fly. These three, alongside many more characters, walk through life as they try to reach their goals.
Pen is a penguin. His favorite things are pancakes and fastidious household upkeep. Pen lives in the city with his friend Hayakawa, a human. They can’t communicate in words, so the only way for Pen to express his love is by doing laundry and getting good deals at the supermarket.