Leibnizian, Leibnizian optimist, Pollyanna, aspirant, aspirer, bright, cheerful, chiliast, chiliastic, couleur de rose, hopeful, hoper, irrepressible optimist, millennialist, millennialistic, millennian, optimist, optimistic, perfectibilist, perfectibilitarian, perfectionist, philosophical optimist, ray of sunshine, rose-colored, roseate, rosy, sunny, upbeat, utopian