Philemon is a servant of Lord Cerimon. His contribution to the plot is to respond, "Doth my lord call?" and then run off on an errand for his master. He never returns
Ruthless, cold and brutal, Aaron thrives on the suffering that he is able to cause the other characters in the play, and acts with no motive other than a love for causing misery.
Yeah he could easily play this character with little effort.