Several real-life celebrities who had fond memories of Scooby-Doo dressed up as one of the gang members for costume parties. These include:
The cast of Girl Meets World all coordinated their Halloween costumes and dressed up as Scooby-Doo characters for Halloween in 2014. The below picture features (left to right) Peyton Meyer as Fred, Corey Fogelmanis as Shaggy, Sabrina Carpenter as Velma, Rowan Blanchard as Daphne and Auggie Maturo as Scooby-Doo.
Pop singer Gwen Stefani and her husband, country musician Blake Shelton dressed up as Daphne and Shaggy for their son's 4th birthday party.
Though not "celebrities," several now-famous high school students at Marist Catholic High School in Oregon decided to come to school dressed as Scooby-Doo characters for their school ID pictures.