Shaggy Rogers

Shaggy Rogers is a main character in Scooby Doo and the Ghoul School, serving as the main protagonist of the movie.

Biography
Shaggy is a male human with - no pun intended - shaggy hair and a small goatee. He is a member of Mystery Incorporated, however in this film none of the other members except Scooby-Doo appear. He is notable for being a coward and having an enormous appetite, traits that were slightly toned down in the film.

Role in the movie
Shaggy, along with Scooby and Scooby's nephew Scrappy-Doo, are gym teachers at Miss Grimwood's Finishing School for Ghoul Girls. Although originally frightened by them, Shaggy eventually warmed up to them, even helping them win a volleyball game against the Calloway cadets.

However, he was hypnotized by one of Revolta's bats into bringing the girls into a swamp, where all the girls were hypnotized and brought to Revolta's castle. In a rare moment of bravery, Shaggy - along with Scooby, Scrappy, and Matches - headed towards Revolta's castle to rescue them.

In the castle, Scooby encountered the mirror monster, who proceeded to trap him in the mirror. During his time in the mirror, he was able to learn from a brainwashed Elsa that the girls were to be revoltized at midnight. He was eventually freed when the mirror monster ran back into the mirror after Matches burned him, and started to search for Scooby when he realized he had disappeared. This caused him and the gang to be thrown into a well with the Well-Dweller, although they were later able to escape thanks to Scrappy tricking it to play a ball game, which created a ladder that the gang could climb. As they continued to search for the girls, Shaggy and Scooby accidentally stumbled onto a rotating wall, which slid them down into Revolta's lab and knocking Tanis and Winnie off the potion, freeing them.

The Grim Creeper proceeded to capture him and Scooby, however Tanis and Winnie came to the rescue by pulling against the Grim Creeper and releasing him, causing the Grim Creeper, Shaggy, and Scooby to fly back up the slide, although they were later recaptured. During the fiasco, all the other girls managed to be freed and, with the help of the Calloway Cadets on their foot-pedaled helicopter, they managed to defeat Revolta. When the Castle was about to explode, Shaggy and everyone were rescued by the cadets and returned safely to the school.

Because of his help in rescuing the girls and their victory in the volleyball game, Shaggy's popularity as a teacher soared and many other monsters came to the school. Despite having warmed up to the girls, Shaggy and co. decided to bail when they saw the new students. When driving away, Shaggy and co. saw the girls wave goodbye, and they howled in response.

Trivia

 * Throughout the movie, Shaggy wore a red shirt instead of the green shirt of his iconic look.