The mythologies that humanity has come up with are indeed fascinating. But I think that if you always put other people into old archetypes, you run the real chance of imagining them as something they are not. Instead of getting to know them for what they are, you are assuming you understand them before you actually do.
That's why I wouldn't be thrilled if you assumed you know me for "the timeless beauty" I am and started ascribing traits to me that I haven't exhibited, but you feel apply because they applied to the character I reminded you of for some reason. More often than not, real people will have more dimensions to their character than the mythological figures you might feel like comparing them to.