If you're looking for manga similar to Bad Badtz-Maru no Ore wa Yuutousei, you might like these titles.
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!!
Miyu, who was doing a live radio broadcast from under the sea, said, "Listeners to the broadcast, I have just discovered a strange little machine-like object at the bottom of the sea." When she turned on the device, the ice expanded and formed a large ring. Penguin children playing in the ice circle. The children's play was also broadcast live, but their number was decreasing before they knew it ...? A mysterious radio broadcast in the shining aurora borealis of the Antarctic Ocean. Why don't you listen to it too?
A comedic manga series about a penguin named Beckham Kinoshita who attends Kirikabu Elementary School and likes to eat hamburgers and hot chips.