Who are three characters in Macbeth that have internal conflicts, and what are they?

In Shakespeare's Macbeth, Macbeth, Lady Macbeth, and Banquo are faced with internal conflicts.

Macbeth is ambitious and wants the throne, but feels guilty about killing Duncan to get it.  He worries about his eternal salvation, about how humbly Duncan ruled, and about how his reputation has greatly increased lately and he doesn't want to risk losing that. 

Lady Macbeth feels guilty for her part in Duncan's murder.  She is a driving force behind it.  This leads to the murders of Banquo and Macduff's family, though she doesn't play a direct part in those.  This guilt leads to her mental breakdown and suicide.

Banquo strongly suspects Macbeth of treachery.  Yet, he has no proof and he is Macbeth's friend.  He is also conflicted because his heirs were predicted to be kings, and he treasures the thought of that happening.  He, however, behaves nobly and does not let ambition lead to treachery as Macbeth does.