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Hiyayatchi (ひややっち Hiyayatchi) is a female child-stage Tamagotchi character that appears on the Tamagotchi 4U.
Hiyayatchi looks like a white cube with stick arms and legs. She appears to have yellow, fluffy hair with a red heart on top. She resembles hiyayakko, or "cold tofu", a type of food in Japan.
Her name may come from hiyayakko, the Japanese dish she resembles, or hiyayaka, meaning "cold" which could be a reference to her ice cube-like appearance.