Strong-Willed: Lady Macbeth (she is insistent that Macbeth follow through with the murder and become the king she thinks he was meant to be)
Wavering: Macbeth (he is unsure of whether or not to kill Duncan. He appreciates what Duncan has given him, and doesn't want to betray that.)
Loyal: Duncan (he appreciates Macbeth and Banquo, and sticks with them, trusting them (especially Macbeth) beyond measure)
Meek: Banquo (Banquo does not speak up much in the first two acts. He tries to bring the issue up to Macbeth but Macbeth dismisses him and he does not try again to talk about it)
