The Devil

The Devil is a character in Your Guide who has helped Skyler various times, the first of which being removing the curse set upon Skyler in episode 2. In which he was contacted through a ritual which was, essentially a skype call.

In "Your guide to living in a world with Salamander & shrinking" the Devil is seen in person, alongside God, he is shown to be wearing a red t-shirt.

In "Your guide to living in a world with demons and inconsistency", the devil is listed as one of Skyler's allies but as more of a mutual benefactor.