Lord X

Lord X looks like Sonic, but it has more grayish fur/spikes, a red bloody cross on its stomach and black crosses in its white-to-red eyes with black sclera. Also, its dark-grey feet (not actually shoes), dark-golden teeth (12 on top, 11 on bottom, 23 in total), whiskers and different shape of face (wider face, big chin etc.) differ it from both Sonic.exe and normal Sonic.

His decaying form is similar to his standard form in the terms of shaping, but it has a different palette. It has green-ish fur/spikes instead, less dark red and more light yellow skin.

In his internal form, Lord X's entire body is black with purple highlights (excluding head), itself being very tall. Unlike any of his other forms of Sonic, it's eyes are split. In this form it is seeable that Lord X's shoes are its feet.

In his void form, Lord X has a color scheme similar to his decaying form. Lord X's body splits into two halves, with his hands becoming purple and similar to his Internal form's.

In his faker form he looks exactly identical to Classic Sonic himself, besides that he has yellow teeth, and eyes that glow red in the dark.