He hates sleeping on newspapers on the floor and would rather sleep on a bed. He hisses when he does not like something or when he does not get his way. His attitude is also not the best.
Role in series
Larry is the second pet that SpongeBob brings home after Gary chooses to live with Patrick, following Rex. One of the first things SpongeBob does with Larry is feeding him. However, Larry hisses at the food and a frightened SpongeBob takes it away.
A little later, SpongeBob prepares himself to go to sleep and had put a bunch of newspapers on the floor for Larry to sleep on. However, Larry hisses and rips up the newspaper and takes over SpongeBob's bed, forcing him to sleep on the floor.
The next day, Larry watches television until SpongeBob interrupts him with a snail joke. Larry is not amused by this joke and angrily hisses at SpongeBob, before leaving out of distaste for him and probably runs away like Rex did.