Sonic.EXE is the central antagonist of the mod, and the main antagonist of his titular creepypasta.

Appearance

Sonic.EXE looks like the normal Sonic, except there are several
noticeable differences to his appearance. Exe's fur and quills are a
darker blue, less smooth, and more unkempt. His skin is also paler, with
a black color fading into his forearms, hands, forelegs, and feet. He
is seen to have claws, which can be either black or purple. Exe has a
wide mouth, and his teeth are fanged and yellow, a side effect of when
his body was first made. He has pitch black eyes, usually accompanied by
red irises, although this can vary.

Exe 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,
Exe's eyes hurt greatly. When Exe isn't crying blood, one can see a
faint but noticeable rash under his eyes.

In the case of this depiction of Sonic.exe, it appears that an
extra set of hands sometimes emerge from his mouth. During his up pose,
two purple tendrils also appear from his mouth.

“HELLO. DO YOU WANT TO PLAY WITH ME?”