Though Shakespeare gives Caesar some personal weaknesses – physical frailty, excessive ego, indecisiveness –  in general he portrays Caesar as a model of the classical Roman virtues:

• Valor. Caesar has not put off going to the Senate, shrugging off the various warnings and bad omens: "Cowards die many times before their deaths; the valiant never taste of death but once."
• Service to the State. Caesar insisted on hearing all the other petitions before taking up the one which dealt with his own interests: "What touches us ourself shall be last served."
• Friendship. Caesar is a generous host to the conspirators, even on the day of his murder: "Good friends, go in, and taste some wine with me; and we, like friends, will straightway go together."
• Respect for the Gods. Caesar orders a sacrifice to the gods before venturing the Capitol to chair a meeting of the Senate: "Go bid the priests do present sacrifice, and bring me their opinions of success."
• Constancy. Caesar refuses to be swayed by emotional pleas, but sticks to his prior rulings and principles: "Let me a little show it, even in this — that I was constant Cimber should be banished, and constant do remain to keep him so."