Greppe wears a yellow suit jacket and matching trousers, Mink Tie, White shirt and has floppy grey hair.
Greppe gives the following puzzles in Professor Layton and the Last Specter:
After completing the puzzle Evacuate!, Greppe gives the course Undersea Pipes for the Fish mini-game.
In the middle of Professor Layton and the Last Specter, Professor Layton makes a plan to get a good glimpse of the Specter. In order to make this plan work, he needs a well-respected resident of Misthallery to help evacuate the residents from the Specter's destruction. This is also to catch Levin Jakes out since the police of Misthallery cannot know about the secret evacuation
Greppe agrees after mild persuasion and after the puzzle Evacuate! is solved.
"Before Evan Barde's untimely death, Greppe was set to become the next mayor and bears a grudge against Clark. Despite his sharp tongue, Greppe is a well-respected denizen of Misthallery."