Find the missing character?

A
O
U
Z

The missing character is U.

The other characters in the sequence are all vowels. A vowel is a letter that represents a sound produced by the vocal cords with relatively open vocal tract. The vowels in the English alphabet are A, E, I, O, and U.

The sequence starts with the letter A and then goes through the vowels

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in alphabetical order. The next vowel in alphabetical order is U. Therefore, the missing character is U.