Why is Odysseus an archetype?
He portrays values of the Archetypal hero.
The archetypal hero is one who is seen as a leader and often has a trait which defines them above all else.
Odysseus was best known for his wit and cunning during the Trojan war and this earned him the name of a 'hero' (a mortal who possessed god-like powers or traits).
In Homer's Odyssey Odysseus is rather arrogant and self-centered but he is the one leading his army along and taking charge.