Mark Grayson, the protagonist of "Invincible," He is a young man with an athletic build and a distinctive appearance.. Here is a detailed description: 1. Age and complexion: Mark is a teenager, around at the beginning of the series, with an athletic and well-defined build due to his training as a superhero. 2. Hair: He has black hair, usually short and slightly messy. 3. face: His face is youthful and symmetrical, with a strong jaw and large, expressive brown eyes. 4. Casual clothes: When he's not in his superhero suit, He usually wears casual clothes typical of a teenager, like t-shirts, jeans and jackets

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