Gustavo da Silva Mello, also known as Omnix, and as Gu 10, is a Hybrid Celestialsapiyan raised on Earth and he is the main protagonist of the fanfic series, MIRACULOUS -ミラキュラス-. 

He was an ordinary fourtheen-year-old boy until he gets the Omnitrix on his Birthday, a powerful alien space watch-like device that allowed him to turn into 10 different aliens.
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Note: This is my OC character.