Strict. If you were to choose one adjective from the multitude of adjectives available, strict would be the one that you would use (knowing full well that Gala would appreciate the subjunctive form). So what if he is the first of four emperors in 69CE? So what that he doesn't last long? Who cares if he is clearly a public school headmaster from 1950's England in disguise? All that needs to be answered is, does he have a certain Je Na Caesar? (and why, oh why, did he not just pay the bloody Praetorian Guard a damn bonus?)