It may seem redundant at first as strictly speaking an archetype simply an example of something, in short every trope is a story archetype. However here we are using the term in reference to a concept in Jungian Psychology of the same name.
Archetypal Character is a character who appears over and over in legends far and wide even in cultures that have shut themselves off from the world. The
blood drinking risen dead are an
Archetype as almost every culture has come up with their own legends independent of each other. Angel is an archetype: the tragic hero trying to overcome the evils of his past.
Coyote is an archetype. Xena is an archetype. Gruff Grandpa is a
Stock Character. Any of these may be disguised as an
Alien.
Some lit-theories classify archetypes by the role/purpose the character inhabits for the story. These classes are:
Protagonist, Antagonist, Reason, Emotion, Sidekick, Skeptic, Guardian, and Contagonist.