Fics like The INVINCIBLE OMNIGIRL!!! by Vgn Golley and JokerGames1999

Marceline 'Marcy' Grayson is a Viltrumite/Human Hybrid who was born from Nolan and Debbie Grayson and grew up to be a kind and innocent girl who wants to do some good in the world and then comes the Omnitrix, a mysterious alien watch with the power to allow her to transform into a multitude of aliens. Watch out world because when lives are on the line, It's Hero Time!

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