Louis is one of the less known members on the Black Ravens. He stands on the opposite side of the market than Marilyn.
Louis wears a purple shirt, red coat and glasses. He also wears white trousers and black shoes.
Louis gives the following puzzles in Professor Layton and the Last Specter:
"The eldest of the Black Ravens, Louis is skilled in espionage and closely follows those in search of the black market. He will always watch his friends' backs in times of need, but his spendthrift father often gives him his own share of troubles."