Lumpsuckers or lumpfish are coldwater fish that live in the Arctic, North Atlantic, and North Pacific oceans. There are over two dozen species of them, but a few of the smaller kinds appear to have Ponyo-like faces, especially the one above. From CalAcademy:
With their befuddled-looking expressions, globiform bodies, and comically poor swimming skills, Pacific spiny lumpsuckers (Eumicrotremus orbis) are almost impossible to observe with a straight face. These entertaining little creatures, however, also possess some pretty striking adaptations. Their standout trait is a true evolutionary wonder: What was once a set of pelvic fins has fused to form a large, surprisingly strong sucker disk, giving the orb-shaped fish the ability to anchor itself to rocks, kelp, and eel grass.
…and balloons. Here are some adorable lumpsuckers on a balloon at Epson Shinagawa Aqua Stadium:
Here’s a red one that yawns:
And this one appears to be hanging out with a friend: