The Humans in Five Nights at Treasure Island are characters that are human and have at least some importance to the main storyline.
Jake is the player character for Five Nights at Treasure Island. He was hired to work for the SSA as an intern under Greg and Lisa after Henry went missing in Pirate Caverns. He is the only human on the island during the events of the game because of the team's small budget caused by going back and forth searching for Henry.
Greg is the phone caller who works for the SSA above Jake. He calls on Night 1 and explains many of the game's mechanics as well as some of the game's plot. It is worth mentioning that he hints at Henry's existence later on during his call.
Jeff The Killer is Evil and Murderous human without a mind. Jeff The Killer seems to wear a white jacket which is covered in blood, with a black shirt worn underneath. Jeff's face includes his whole mouth missing showing his teeth, which a blood outline stained on the skin around his teeth. He only appear in mini-game named "Jeffery's Game" after Night 1 if the Player manages to get through the whole night without shuting off a camera.