Mephiles Disorder

Mephiles Disorder is a disease created in the Gmod Adventures pilot, "The Introductory Episode".

It is said that Shadow himself has this disease, although we never see Mephiles himself in the pilot controlling Shadow.

Shadow is possibly the first person to get Mephiles Disorder, as nobody else in-pilot lacks a mouth.

If this is the case, however, Shadow COULD be hiding something.

Shadow would have to be immoral for him to be secretly Mephiles, which we see is not the case as he cries when he mentions Maria.

Shadow is, however, still slightly cocky, another trait of Mephiles the Dark, So he could still be Mephiles in disguise.

However, It's more likely that Shadow is just cocky as it is his defining character trait, and isn't secretly Mephiles.

Mephiles Disorder could possibly be a disease meant for Sonic, Shadow, and Silver, But because we never see Sonic or Silver in-pilot and only see Zeena and Shadow as far as the Sonic series goes (Not counting Chaos 0, Who appears, only to be deleted due to being impossible to pose.), It is highly debatable.