* A book title: There are many books with the word "shishu" in their title, in various languages. To tell you the author, I need the full title and the language it's written in.
* A character in a book: If "Shishu" is a character, I need to know the book's title.
* A general term: In some languages, "shishu" might refer to "child" or "baby". In this case, there's no single author.
Please provide more information so I can help you find the author!