If it is true that when we use a name, it must be the name of something, what is it that we name when we use terms such as Sherlock Holmes, Odysseus, and many of the same type? What is it we are addressing and how do the referential relations work assuming that we are thinking or talking about something when we use these terms? Otherwise, if we are speaking about nothing when we use a fictional name, how do we understand the linguistic process which gives us the impression of speaking about something? This book develops a critical study of some theories which deny any ontological existence to fictional characters. It provides an analysis of the contribution of these terms to the meaning of the sentences in which they are used and on the structure of thoughts adopted in assertions about fictional characters.