When I first started thinking about why the original Master was such a delicious villain, I thought in terms of his characteristic muahaha!! He seemed like a wonderfully campy nemesis for the Doctor, and though I don’t know that the character ever literally said, “they laughed at me at the Academy!” I really felt he should have.
As I went back over some of the Master’s stories I’ve seen so far (remember that I haven’t seen them all) and watched the DVD extra on Frontier in Space about his career and tragic death, I realized that what Katie Manning (who played Companion Jo Grant) said of him was true: “he never camped it up.” The character itself is something of a caricature, but Delgado always played the Master straight.
His Master was intelligent, polite, charming, sharp-witted, suave, persuasive (even without the hypnosis), and completely evil. He cared not one whit for what damage his plans might do to the universe or any minor players, as long as he got a thrill from it – and showed up the Doctor. With the easy way he could arch his eyebrow with disdain, he had me at “universally.”