The Question and Answer section for Doctor Faustus (Marlowe) is a great resource to ask questions, find answers, and discuss the novel.
Mephostophilis serves as the antagonist. He is fully invested in destroying Faustus, and even encouraging him to waste the power he traded his soul for.
Faustus' ambition is to have supernatural power...... absolute power and knowledge.
The Emperor is very happy that Faustus freed Bruno from the pope. He wants Bruno to become pope. Ferdinand is also thrilled by Faustus' performance.... his conjuring, but he eventually asks Fautus to stop tormenting Bruno.