Patrick is depicted as a pink, dimwitted, overweight starfish and the best friend of SpongeBob SquarePants. He has been shown to make many idiotic mistakes such as forgetting how to eat, and not realizing that the character Sandy Cheeks is a female. Despite this, he has occasionally been portrayed as somewhat of a savant, with articulate observance to certain subjects in specific detail. However, he always reverts quickly back to his usual, unintelligent self after displaying the moment of wisdom. Patrick has been shown to enjoy eating and seems to particularly love doughnuts, Krabby Patties, and ice cream. He holds no form of occupation except for several very brief stints working at the Krusty Krab in a variety of positions (often unpaid), and mostly spends his days either clowning around with SpongeBob or lounging beneath the rock under which he resides. At home, Patrick is typically depicted either sleeping (stuck to the bottom of his rock), watching TV (whether the TV is actually on or not), or engaged in the "art of doing nothing," at which he is apparently an expert. All the furnishings in the space under his rock are made of sand, and Patrick can simply opt to quickly build up furniture as needed; even so, his living space is sparse and contains only the barest essentials. Aside from best friend Spongebob, who is often impressed by Patrick's capacity to come up with naive yet genius plans or solutions, Patrick frequently irritates those around him and is confounded by the simplest of questions or subjects. The characters of Eugene Krabs and Squidward Tentacles have no patience for Patrick's stupidity, and don't pay him much regard.
Patrick leads a simple, carefree, sedentary existence beneath a large round rock with an antenna on top, that comprises the row of residences including SpongeBob SquarePants' pineapple home, and Squidward Tentacles' tiki-head house. He has no regular job nor any steady form of income, and seems to get a majority of his food mooching off best friend Spongebob. He has an insatiable appetite and will eat nearly anything, including Gary's pet food. Patrick spends a majority of his time lazing about or doing inane, inexplicable things like staring at lamp posts (to catch when they move), or "watching" TV when really it is only static. But, Patrick also enjoys activities such as hide-and-seek, bubble blowing, jelly-fishing, or playing ridiculous made up games with SpongeBob. He is always game for anything fun, such as going to local amusement park "Glove World," camping, spending a day at the zoo, or playing "pirates" and searching for lost treasure. Like his closest friend, Patrick invariably winds up unintentionally antagonizing his ill-tempered, uptight neighbor Squidward Tentacles. Spongebob and Patrick are both naively oblivious to Squidward's intense animosity towards them and his distaste for their immature and "uncultured" activities, but it has been implied that the pair intentionally try to agitate Squidward on occasion.
Patrick has also exhibited sassy or sarcastic tendencies and can be curt, short-tempered, even insulting. His good nature is sometimes overridden by his competitiveness, and he can get carried away with determination, or not realize his own strength. He also has the tendency to become corrupt with power, despite the fact that he is otherwise generally unconcerned over material possessions. His concept of money is less than remedial and he has no ability to manage it in any quantity, without realizing its value.
Patrick has negatively influenced or misled Spongebob in the past by inadvertently encouraging him to engage in hazardous activities, yet Spongebob rarely loses faith in his best buddy. Despite having a sort of simple-minded selfishness about him, Pat is a loyal friend who would do or give anything to assist his best friend to make him happy.
Patrick's seeming lack of intelligence and unabashed laziness earn him a reputation of incompetence all over Bikini Bottom; yet despite this, in a number of instances he's displayed signs of near-genius artistic creativity, even to levels of great fame (or infamy). But his brilliant ideas are forgotten no sooner than having declared them, and in the end it is always too mentally exhausting for him to handle. Patrick always ends up going back to the simple existence he knows, living under his rock.