SpongeBob RoundPants was the new name temporarily used by SpongeBob when he got himself new pants that were round. He showed them to Mr. Krabs, Patrick, Sandy, Squidward, and many others. SpongeBob thought that nobody recognized him with the round pants due to Patrick not identifying him as SpongeBob SquarePants.
He has the same design as SpongeBob SquarePants, but has round pants that have the same design as his regular pants.
SpongeBob behaves like he is a new worker at the Krusty Krab, and asks for Squidward's help. Following Squidward, he starts copying Squidward's actions, such as being rude to customers, throwing the trash out to the dumpster, sleeping in the bathroom or at the register, and even cooking patties like Squidward (burning them). He is gullible, much like his original identity's character.