Dark Springtrap: He will come through the vents and the left door. Use the audio distraction to prevent your death, he is inmune to the door, door vent, and vent lure.
Radiactive Foxy: He will appear in the Pirate Cove, he will made the toxicity go further and further, if he stays too long on the pirate cove, you will die. Look at him to prevent it.