Catanova is a cat who only Luke Triton can understand. He can usually be found at the Black Market in China Town. He is not a major character in the game. He appears in the game Professor Layton and the Unwound Future.
Catanova gives the following puzzles in Professor Layton and the Unwound Future:
"Not even the awful dogs can discourage the devoted Catanova from visiting his lady friend. He's a cat of few mews, though his sleek looks certainly make him popular with the ladies."