SpongeBob SquarePants is the main antagonist of five nights at the Krusty Krab, he will become active on night 1 he will go throughout the restaurant until he will appear at the right door close it or he will attack you. In Fnatcb he will attack from the left door. If you don't close it in a short amount of time he will kill you.
Spongebob's jumpscare in Fnatcb looks like he's slapping you in the face.
His head looks the same as fnakk SpongeBob but he has brown eyes and Fnatl SpongeBob has blue eyes.