The character who tells Macduff to channel his fury against the murderer of his family is Malcolm.
The character who tells Macduff to channel his fury against the murderer of his family is Malcolm. After Macduff receives the devastating news of his family's murder, he is overwhelmed with grief and anger. Malcolm, who is Duncan's son and the rightful heir to the throne, advises Macduff to use his emotions as motivation for seeking revenge and justice.
In Act IV, Scene 3 of William Shakespeare's play "Macbeth," Malcolm and Macduff have a conversation about the state of Scotland and the need for a strong leader to overthrow Macbeth's tyrannical rule. During their discussion, Malcolm tests Macduff's loyalty by pretending to be unfit for kingship and expressing his vices. Macduff is horrified by Malcolm's supposed wickedness and expresses his desire for vengeance against Macbeth.
Malcolm then reveals that his previous statements were a ruse to test Macduff's loyalty and conviction. He urges Macduff to "Dispute it like a man" (Act IV, Scene 3, line 221) and use his anger as fuel to take action against Macbeth. By encouraging Macduff to channel his fury, Malcolm believes that Macduff will be more determined to join forces with him in their mission to overthrow Macbeth and restore peace to Scotland.
In summary, Malcolm advises Macduff to channel his fury against the murderer of his family, urging him to use his anger as motivation to seek revenge and justice.