Stanley seems to wear clothing extremely similar to SpongeBob's, except Stanley's doesn't have the lines SpongeBob has on his pants. He also has longer pants and black hair split into two sides.
According to Mr. Krabs, he looks like, smells like, and tastes like SpongeBob.
He appears to be the tallest member of the SquarePants family. He also seems to be one of the few in the family to have a human-shaped body, but has a square head.
Abilities and talents
Stanley is the complete klutz as he cannot do anything right. Anything he tries to do will fail horrifically regardless of how simple and inconsequential it would be for another person. For example, him simply touching SpongeBob's TV resulted in it exploding. His sole talent would appear to be destroying things without even trying, which Mr. Krabs used to destroy the Chum Bucket. However, he does have several abilities to point out:
Invulnerability - He seemed uninjured when the Chum Bucket exploded with him in the interior.
Bonelessness - He was capable of squeezing in a cardboard box which is small compared to his body.
Destruction - Everything he touches breaks or explodes.
He willfully tries to attempt to find a hobby or occupation, always resulting in chaos or failure. Appearing to be amazed by SpongeBob's lifestyles, he skims his house, touching everything from the toilet to the television, despite knowing that he breaks anything he comes in contact with using his hands. He has little care for the property.
Stanley basically destroys his cousin's house, showing no concern for the latter's belongings with his fascination.
When Stanley takes a job at the Krusty Krab, he shows no regard for SpongeBob, who took the blame whenever Stanley sets something on fire, causing the better worker to be put on probation. He took pictures of his first customer and in one he even kissed him when he was wearing a wedding dress, and he got mad where Stanley then took another picture of him when he pretends to be mad at him. The customer gets even angrier and explodes (literally).
He makes SpongeBob do all the work of ordering and cooking and messes up his station, while Stanley prints his photos. He breaks SpongeBob's spatula and SpongeBob couldn't take it anymore, so he confesses to covering for Stanley. After his cousin's outburst, Stanley realizes his error and breaks down at both failing SpongeBob and causing more destruction in the process. At the end, they make amends and are seen walking to their jobs.
It is unknown of what employment he has, but the conclusion, where all of his applications were turned down, is plausible. He attempts to become a scientist when visiting Sandy but was recommended against it. He took a job as the cashier in the Krusty Krab and failed. When Mr. Krabs realizes this, he gave Stanley the assignment of destroying the Chum Bucket.
He was born to Sherm SquarePants and an unknown Mrs. SquarePants.
In the episode "Stanley S. SquarePants," he was sent to live with SpongeBob for somehow breaking everything he touches and not being able to do anything right. SpongeBob helps him out, only to fail at first. Mr. Krabs finally helps by giving Stanley a job at the Chum Bucket, much to his amusement when Stanley destroys the restaurant.
His episode debut noted that he lived with his father, Sherm. Stanley stated he doesn't have several things in his house, unlike SpongeBob.
Sherm doesn't let him touch anything in his house since he would destroy it on contact.
It is said that Stanley breaks everything he touches, but he does not break the camera when he is taking pictures with the customer.