He is first seen in "Lincoln Loud: Girl Guru", where he asks Lincoln for advice. He tells Pacowski that squirting flowers would make Mrs. Johnson's day. He is later seen with a bouquet of daisies to give to her, though the flowers squirt her in the face, which makes her mad, causing her to push him. At the end, he is seen buying pies to throw at Lincoln.
He is mentioned in "Study Muffin", when Mrs. Johnson came back while still recovering from her broken leg. She ran her wheelchair over his foot, and he couldn't teach gym class. He then called Ms. DiMartino to substitute for him while he recovers.
He is seen being chased by a swarm of bats summoned by Lucy in "Pulp Friction". Principal Huggins later tells Cheryl that the bats have been disposed of and Coach is resting comfortably after his rabies shot.
In "Out of the Picture", he plays an important role for the first time, as he is responsible for putting the yearbook together, and enlists Lincoln and Clyde to help him out. He later dances with Lincoln and Clyde at the end of the episode.
In "Tails of Woe", he is shown dancing to his mixtape during the lunch break and is startled when Lincoln and Stella see him doing it.
When personally angered by a student Coach Pacowski is shown to use his authority as a gym teacher to his advantage. In "Lincoln Loud: Girl Guru", he said to Lincoln and Clyde, "I hope you like pushups!" This implies he was going to make them do extra pushups during gym class, to get back at them for Lincoln's bad advice and for making him look bad in front of Mrs. Johnson. He is also shown to have a violent temper. "Teacher's Union" Lincoln and Clyde attempt to bring Coach Pacowski and Mrs. Johnson together, but fail and cause Mrs. Johnson to reject Pacowski due to misinterperting facts about the coach, causing him to become enraged and try to attack the boys when they admit their actions.
He previously appeared to have a romantic affection for Mrs. Johnson, as seen in "Lincoln Loud: Girl Guru", when he wanted to impress her. In the episode, he took Lincoln's advice of using squirting flowers, only to anger Mrs. Johnson. Later he and Johnson bought a bunch of pies for Lincoln's booth. This relationship is continued, however, in "Teachers' Union", when Lincoln and Clyde try to hook up him and Mrs. Johnson. They manage to get Pacowski to ask her out on a date, but Johnson later breaks up with him because what Lincoln and Clyde claimed turned out to be different stories. Pacowski later started a romantic relationship with the school nurse when he ended up in the medical room due to injuries from the obstacle course.
Coach Pacowski is a fair skinned, hefty man. He wears a red baseball cap, and has a banana yellow polo shirt. He wears red sweatpants, and sneakers not unlike Lincoln's. They are white, and have red stripes where the laces are laced. He also wears a whistle around his neck, and has hair under his forearm.