Ooh, fun! And actually, this is a situation where I'm absolutely okay with a character being fourth-walled, since March knows, from various "Alices" who've come and gone through Wonderland, that the story of the place was made into a book and other media! In his world, a fictional friend of both Carroll and Tenniel was an early visitor to Wonderland who actually managed to return to her own world. So, an Alice!