There are many Alice In Wonderland references in Manga and Anime, from whole series that are riffs on themes from the original Lewis Carroll books, to series that have references to the Alice books but are not specifically based on the books. The obvious answer is that the two Alice books are full of cute characters that lend themselves well to becoming a part of the kawaii aesthetic. But there's another aspect of Japanese culture, its ancient myths and legends, and shadowy supernatural creatures -- Yokai, Obake, Yurei, Oni -- have parallels with Alice's world, whether it's called Wonderland or Underland.
