OnlySP reports that the narrator of Biomutant can be silenced a bit:

Biomutant Narration is Adjustable

Biomutant’s gameplay footage has been mildly criticized for the aggravating, excessively talkative narrator who frequently shouts during combat.

Experiment 101, the developer behind the open-world action-RPG, revealed that the narrator can be silenced to a certain extent. Depending on the amount of time a gamer plays during a single session, the narrator’s settings will scale accordingly.
[...]