What is suggested about Cassius' character even before he appears in Act 4, scene three, of Julius Ceasar?

Cassius, in Shakespeare's Julius
Caesar, is the instigator in the plot to murder Caesar, which is introduced
at the start of the play. He is the one that approaches Brutus to elicit his help as
another conspirator. Brutus is a man who acts from a love of Rome, but Cassius seems to
be motivated more by a political agenda and jealousy.

Act
One, scene two, is known as the "seduction scene," when Cassius first approaches Brutus.
He infers that Caesar is a danger to the state of Rome, but has no real evidence to
support his claims. He comes off as a conniving, self-centered malcontent. Having once
saved Caesar's life, it seems that he believes he should have been compensated more, and
that his position within the empire should have been elevated. Instead he feels ignored
by Caesar, acting like a spoiled child.

Cassius compares
Caesar to a "god" (I.ii.116), while Cassius is nobody, despite the fact that Cassius
saved Caesar from drowning:

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...and Cassius is / A wretched creature, and must
bend his body [bow] / If Caesar carelessly but nod on him
(I.ii.116-118).

Cassius plans
to send Brutus falsified proof to support his desire to see Caesar murdered. And though
he repeatedly follows Brutus' lead in most of the decision-making,
and expresses his love of Brutus, is this excellent "judge of men and their abilities"
(Cassius) being honest, or simply trying to further his own ends? He is definitely not a
man of nobility, dedication or loyalty.