I love the way Fag refers to himself and Jack Absolute as though they are partners in crime, chums, rather than master & servant. In the opening of Act 2 scene 1, for example, he tells Jack that he's met with Sir Anthony and "...I should be glad to fix what has brought us to Bath, in order that we may lie a little consistently."

I've not seen the play, but imagine him played in a languid almost-a-gentleman manner from what we've read so far, his airs with Sir Anthony's coachman Thomas, and his way of speaking to Jack about the braining Sir Anthony gives him as Act 2 sc 1 closes - "Upon my credit, sir, were I in your place, and found my father such very bad company, I should certainly drop his acquaintance."
Sir Anthony's berating of his son, when Jack say's he'll not marry the woman his father has chosen for him, is hilarious, and made me bend down the page corner (bad girl!)"...don't enter the same hemisphere with me! don't dare to breathe the same air, or use the same light with me; but get an atmosphere and a sun of your own!"