Because between all the characters, the Maw is the most important and complex one. Instead of the voices, the surroundings are telling a story, full of mystery and hidden behind ephemeral clues.
There is no space for dialogues in the world of Little Nightmares, everything is apparently purposeless, afflicted by the silence, except for the grunting and the growling of the inhabitants. Because the plot of Little Nightmares is not directly explaining and, together with its lore, need to be discovered thought details and analysis. Each room is enriched in details, from pictures to objects, telling a story that is hidden in a fragmented puzzle. Room after room, the twisted depths of the Maw reveal in front of the eyes of Six, the main character. The Maw is a cryptic and mysterious underwater world, centered around the excesses, especially related to food.
