Ma-u (Demonic Rain)
This is a pun playing with the similarity in pronunciation between "まう" (Mau) and "魔雨" (Ma-u). While "まうちゃん" (Mau-chan) is her cute, regular name, "魔雨" (Ma-u) adds a playful, rebellious twist to it by using Kanji with a more ominous meaning ("demonic rain"). This kind of wordplay is common in Japanese, where the sound of the words can be the same or similar, but the meaning can be entirely different when written in Kanji. This pun fits well with the context of the image, showing a more mischievous and adventurous side of Mau-chan.MAUMAU
