Macduff in 'Macbeth'

Macduff is presented as conscientious through the use of allusions, for he says he has "no words" as his "voice is in [his] sword".

•  The noun "voice" may suggest Macduff's power and strength as speaking is crucial for methods of communication. However, Macduff may only address Macbeth through using his "sword" which will essentially "voice" Macduff's anger through violence, in order to make Malcolm king (as Duncan's oldest sun thus heir to the throne). 
• Malcolm's nobility and dutiful attitude is presented by Shakespeare as a Jacobean audience may have viewed Macduff as morally just as he is fighting for Duncan and Malcolm, who were heirs to the throne rightfully. 
• During the 1600s, several members of the audience may have thought that kings were chosen as God's representative which suggests Macduff is fighting for God and this would have appealed to the largely Christian audience and would have endorsed Macduff's action as conscientious. 
• However, a modern audience may, through the use of allusion, associate the use of the "sword" as murdering Macbeth which may initially lead to dismay by the audience. 
• One might suggest, that the use of violence (as swords are intended weapons to cause harm) may have been the last resort to remove Macbeth as King, so a modern audience may deem Macduff as heroic and conscientious. 
• Moreover, the use of allusions allows the audience to have varied interpretations which will leave them in comfort, so they can trust Macduff to make choices which they deem as dutiful too. 

Furthermore, Shakespeare presents Macduff as a symbol of reality in the play through the use of characters being present in the play. In Act 2, Scene 2, Macduff is the first Thane (of Fife) apart from the murderer (Thane of Cawdor) to have witnessed Duncan's corpse as he reacts in a great deal of panic ("Oh horror, horror, horror!").

• CONTEXT HERE
• By Macduff being presented as one without bias, for he does not play the role of the antagonist (perhaps the witches) and protagonist (Macbeth). The audience may feel a sense of shock as synonymous to Macduff as he emphases the severity of the Macbeth's committing regicide and the unpleasant nature of the murder. 

Shakespeare portrays Macduff as an anti-hero.

 Macduff is present in all parts of the Tragedy in 'Macbeth' and seeks revenge which ought to lead to justice: Malcolm as King of Scotland by divine right.
Macduff being present in all parts of Macbeth's Tragedy suggests the king will always have supporters which will please King James in the audience.