Slate is a well known face in Future London and the children help him paint a mural on the wall of Chinatown. Professor Layton and Luke Triton keep appearing to Slate and help him with puzzles and eventually the mural is finished.
Slate wears a distinctive sweater with the letter 'M' on it with a white shirt underneath.
Slate gives the following puzzles in Professor Layton and the Unwound Future:
"Ever since the wall of Slate's house was covered in graffiti, he's been working with local youngsters to repaint it as a mural. He isn't much good with a paintbrush himself, but his kindness makes him popular with the kids."