narrator
US /ˈner.eɪ.t̬ɚ/
UK /ˈner.eɪ.t̬ɚ/

1.
narrador, cuentacuentos
a person who narrates something, especially a character who recounts the events of a novel or narrative poem
:
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The story is told from the perspective of an unreliable narrator.
La historia se cuenta desde la perspectiva de un narrador poco fiable.
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The documentary featured a famous actor as its narrator.
El documental contó con un actor famoso como su narrador.