Positive Pluto
Let's look at the research of Ebertin. He says that Pluto's principle represents "force majeure or providence, invisible forces or powers."
Psychological correspondences include:
(positive) The will or wish to exercise power, the manifestation of unconscious powers, ruthless frankness or candidness, the urge to influence the masses, propagandist aspirations and objectives, understanding the masses.
(negative) Ruthless use of force or coercion, inclination to incite, a fanatical zeal to state one's own doctrinal principles, to agitate, convulsions and spasms.
Biological correspondences include the collective consciousness, regeneration.
Sociological correspondences include persons who can be said to exercise a magical influence over the masses, suchas propagandists, actors, public speakers and politicians.
We have to recognize that the "Hamburg, Germany School" included many notable researchers such as Vitte and the Ebertin's (father and son) who worked with hundreds of thousands of charts and clients from the late 1800's into the middle 1900's after world war two. They popularized the mid-point system of astrology. While some of their interpretations are shaded with more dire or darker meanings, their interpretations in terms of content and range are very accurate and well founded.
So, what would we take out of this as "positive?" It depends upon the context of the person and chart of course, but I would suggest zeal, intensity, a drive to persist, unflinching determination, possibly courage, a need to succeed, amazing turns of luck and good fortune, the ability to lead others, a magnetic personality.
You may often find that those with Pluto near the ascendant degree have narrower faces than average, eyes that are intense and often closer together (which enhances the appearance of intensity) higher foreheads, hair that tends to be thinner rather than heavier-thicker, and who exhibit (when younger) quick actions, temper or frequent changes in temperament, broken sleep patterns. All of this is mitigated as they approach teen years.
As noted in an earlier post, Pluto doesn't always work smoothly when in tough aspects with Mercury and Moon -- we are talking about mixing the most personal inner planets with an impersonal outer planet -- all of which can have their own strengths that don't work well with the other's strengths. Hope this helps. Dave