#8 - 2013/02/06 12:31:00 PM
Archangel and Deathangel classes wouldn't really fit with the lore, simply because they are not Nephalem. The Nephalem are the offspring of angels and demons, and within them is the combined essence(or spirit if you will) of both angels and demons, which is what is giving the Nephalem the potential to be even greater than both.
but what if an angel wants to become human like tyrael wanted and he still has some angelic powers
An angel may become human as was learned when Tyrael renounced his immortality and was cast from the high heavens, but even if angelic powers are retained after an angel become human, this will still not be enough as those powers are still "only" angelic.