SpongeBob is the main protagonist of the series. Despite being a silly sponge, he is very kind and cheerful.
Howie is the secondary protagonist of the series and is SpongeBob's room mate. His love for jokes sometimes leads to trouble.
Mr. Noisy is the secondary tritagonist of the series. He is the drummer for the house band.
Duck is the main deurotagonist of the series. He owns 1000 jack hammers in his jack hammer collection.