About 30 BC - Aeneas: son of Venus, very emotional (as we saw in the Aeneid), had a great sense of duty/pietas. Great warrior, but nothing extremely abnormal about his physique. Aeneas must constantly struggle with a source of evil, the furor of Juno.
1200 AD - Sir Lancelot: Archetypical knight. Mighty in war and nice to the lady folk. The theme of chivalry rises up in this period. The way Aeneas handled his situation with Dido would not have been okay with the knights. Thus, the notion of responsibility is further developed to include a attention to the feelings of others.
1938 AD - Superman: born on a foreign planet, Krypton, he's an alien that has emotional cares for the people of earth as a whole. He's freaking invincible, save for his Achilles heel (reference intended), Kryptonite. The notion of responsibility has been extended to people whom the hero does not know, and the concept of good vs. evil is most prevalent, as in the Aeneid.
1976 AD - He-Man: a paragon of modern masculinity. This guy has about eight bicep muscles for every real human bicep muscle. He wields a sword about as big as he is tall, and he defeats evil with swift and exacting justice.
With the emphasis literature has placed on strong male figures, men have an unrealistic social standard to live up to. I don't think this problem is addressed enough in modern times, so here's a summary: