His former blue fur turns to indigo purple as the blood on his gloves covers half of his fingers. His spines are bigger but even messier and more crystallized, and this also reaches the eyebrows and tips of the ears. In this form, his height increases again, now dwarfing Lord X even uncrouched. In Triple Trouble and Final Escape, Sonic.EXE takes on a more beastly form known as Xenophanes his current official form created by his owner ASTRAMONICONX. The characteristics that point to his next transformation are not present in older versions of the sprites in the alpha version of YCR, Sonic.EXE has a more slender and grotesque appearance, with spiked fur and even fur, giant arms and fingers, and purple-rimmed pupils.

EXE has his back to BF, with a more serious look and closed eyes in his idle. The Encore version retains these features, except that. However he still retains his jumbled and twitched flesh, also showing more of it around his eye sockets. When altering reality to something more retro, he turns into a pixel version of himself, with tidier fur and eyes more similar to the normal ones. In the center of his chest, a small X-shaped cut can be seen, while the upper tips of his eye sockets expose a small part of his dark gray skull, and having small amounts of blood in all the fingers of his gloves.

These crystals have a light purple color, while his blue fur also receives a more purple tone. The tips of his quills on the head and belly are more messy, while they, along with the eyebrows have slighty crystalized parts. In You Can't Run, he has a significantly larger body stature, with his chest slightly thrust forward and a menacing look, at the same time doing his signature 'title screen pose'. His blood also has a more pink tone compared with a human one. The sclera of his eyes are black, while his 'pupils' are small dots, with the addition of a mysterious semblance of Sonic.EXE which is the constant production or excretion of blood in his eyes that oozes into his lower eyelids, leaving a birthmark that hurts and stings his eyes. Overall, Sonic.EXE has darker blue fur and more saturated or paler skin in versions prior to 2.5/3.0. Sonic.EXE looks almost identical to Sonic (specifically Classic), but has notable differences.

He is the opponent of Too Slow, You Can't Run, Triple Trouble, The Encore Variants and Final Escape and was planned to be a playable charaacter in Slaybells. exe, is the central antagonist of the eponymous mod, and the antagonist of the eponymous creepypasta in which he debuted in 2011 along with a duology indie game.

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