I find Cassius to be an extremely captivating character, and I would love to discuss any alternative interpretations of him that you might have. I think it is possible to view him as a very sympathetic and complex character, and I am not convinced that he is truly more villainous than the "noblest roman of them all." As a starting point, I would like to share one theory that several scholars hold (Johnson, Capell, Furness and Hunter) that I came across and which I find crucial in assessing Cassius. Cassius' soliloquy at the end of act one, scene two is often believed to reveal Cassius as a heartless Machiavellian, aware of his own corrupting influence but fully committed to killing Caesar at any price, even the honor of his friend. The words, at first glance, certainly suggest this:
Well, Brutus, thou art noble; yet, I see,
Thy honourable metal may be wrought
From that it is disposed: therefore it is meet
That noble minds keep ever with their likes;
For who so firm that cannot be seduced?
Caesar doth bear me hard; but he loves Brutus:
If I were Brutus now and he were Cassius,
He should not humour me. I will this night,
In several hands, in at his windows throw,
As if they came from several citizens,
Writings all tending to the great opinion
That Rome holds of his name; wherein obscurely
Caesar's ambition shall be glanced at:
And after this let Caesar seat him sure;
For we will shake him, or worse days endure.
When he says "Therefore it is meet, that noble minds keep ever with their likes," it seems that Cassius is admitting to lacking nobility and acknowledging that he is "seducing" Brutus. It is possible, however, to read Cassius' comments regarding Brutus' ability to be seduced as an expression of concern that Caesar is seducing Brutus. There is a passage in Plutarch, one of Shakespeare's main sources for this play, that could echo this.
Howbeit, Cassius's friends did dissuade him [i.e. Brutus] from it ... and prayed him to beware of Caesar's sweet enticements, and to fly his tyrannical favours: the which they said Caesar gave him, not to honour his virtue, but to weaken his constant mind, framing it to the bent of his bow. (Brutus, pp. 110-11)
Therefore, Cassius would still be showing a willingness to manipulate Brutus, but it would be because he truly cared for Brutus and did not desire him to be corrupted. I find this very compelling, but wondered what you thought. Is it too revisionist?
Any other theories that you might have regarding Cassius would be very welcome . I just love his character.