The Chao (チャオ?) are creatures that appear in the Sonic the Hedgehog series. Their role in the games are to be raised by the player in mini-games, similar to many virtual pets. Chao are somewhat complex: they respond to stimuli, have moods, require food and can be loving or fearful. The word Chao is a pun on Chaos, a word commonly used in the Sonic series and which is why the word remains unchanged when plural. The Chao are the good friends of Cream the Rabbit and Tikal. The most prominent Chao character in the series is Cream's best friend Cheese.
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