Sammy's ink form appears as a black, slightly muscular human figure wearing a smudged Bendy mask with a hole punched into the mouth, presumably to help him speak without his voice being muffled. He has no visible hair, most likely due to the ink.
Unlike his human personality, Sammy has become fanatical and rather mentally unstable, as well as somewhat psychotic and unhinged, to the point of worshiping The Ink Demon as his "savior" and offering him sacrifices to appease him.