User blog comment:Purplesky2/Soul king a Quincy?/@comment-24531362-20150103083933

In a word, no, it does not necessarily make the Soul King a Quincy (he could never be part Quincy in any case). The way it has been explained, Yhwach is the first Quincy solely do to the Auswahlen ability that he alone possesses (as far as we know). The Quincy ability to absorb, manipulate, and discharge Reishi is most probably a derivative of this ability, likely gained as a result of Yhwach's early soul-sharing (i.e. prior to the development of the Schrift system) and passed down through heredity. If the Soul King lacks either Auswahlen or traditional Quincy Reishi manipulative abilities, he is not a Quincy by definition of the word. In that case, it would become true that Yhwach being the proto-Quincy arose due to natural evolutionary methods, such as spontaneous mutation. Please keep in mind that without further evidence as to the nature of the Soul King by Kubo himself, all of this must be considered pure speculation.