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Dappya (だっぴゃ, Dappya?) is a triton-like race of mutant fish, originally from Takahashi's first published comic Katte na Yatsura, a 30-pages story that anticipated Urusei Yatsura.

The Dappya Kaijuu (Dappya Monsters) are fish-like creatures in environment suits. They seldom play any major part in the story, but appear quite frequently in the background or make odd statements. In the anime, they also have a high, squeaky voice.

The Dappya Kaijuu are not actually aliens, but live deep in the oceans. Presumably this means that they are wearing diving suits. The name refers to the fact that they tend to end each sentence with "Dappya!" (in the original Japanese...).