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QUICK ANSWER
"Quién es el" is a form of "quién es el", a phrase which is often translated as "who the...is". "Narrador" is a noun which is often translated as "narrator". Learn more about the difference between "quién es el" and "narrador" below.
quién es el()
A phrase is a group of words commonly used together (e.g., once upon a time).
a. who the...is
¿Tú sabes quién es el mejor jugador de fútbol hoy en día?Do you know who the best soccer player is nowadays?
el narrador, la narradora()
This means that the noun can be masculine or feminine, depending on the gender of the noun it refers to (e.g., el doctor, la doctora).