Sonic.exe looks exactly like his idol, Sonic the Hedgehog, except there are several noticeable differences to his appearance. X's fur and quills are a darker blue and less smooth and more unkept, his skin a sickly pale color, with a black color fading into his forearms, hands, forelegs and feet, symbolizing X's dark matter in a way. His claws are sharp and pitch black (though sometimes they're also a bright purple). X's mouth is often unnaturally wide when he smiles and it's always fanged and yellow (JC explained that the yellow on his teeth is not a result of tooth decay but one of the few side effects when his body was first made), and his eyes are pitch black, with two glowing red dots as irises with very tiny pupils. For some reason X seems to always produce blood under his eyes even when he's not actually crying, though this is a major birthmark (when he was born, X's eyes hurt greatly). When X isn't crying blood, one can see a faint but noticeable rash under his eyes from crying so much blood.

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