Penguin? is a green, soft-spoken member of Sumikko Gurashi, but there’s one little mystery—are they really a penguin? Unlike the others, Penguin? isn’t quite sure of their identity. There are rumors that they might have once been a kappa (a Japanese water creature), but no one knows for sure. Despite the uncertainty, Penguin? loves cucumbers, enjoys reading, and occasionally reminisces about a mysterious old plate they may—or may not—have once had. Quiet yet curious, Penguin? finds comfort in the cozy corners of Sumikko Gurashi, surrounded by friends who embrace their uniqueness.