It appears to be in a slumped position, similar to that of Golden Freddy's. It also uses Golden Freddy's model. Brightening up this image reveals that this hallucination is purple in color, bearing comparisons to the purple figure from the secret minigames, and the Marionette's "tears." What this color scheme means is unknown, if it means anything at all.
Shadow Freddy acts rather similar to Golden Freddy in the first game: they are both apparitions of Freddy in a similar slumped position, appearing at random on a certain camera, and they crash the game if looked at for too long. Shadow Freddy, however, appears on the camera, whereas Golden Freddy's poster is located on the cameras and he himself is in The Office. However, Shadow Freddy doesn't crash the game via jumpscare, unlike Golden Freddy.
Name: Shadow Freddy
REAL Name: ???
Nickname: Shadow Golden, Purple Freddy,
Age: Unknown
Gender: Male
Likes: ???
Dislikes: ???
This version of S.F is:
Aggressive
Shy
(More to come)
[current location: At Parts & Service]
[current thoughts: None]
[current actions: Hitting something]