I have a Virgo Asc with Mercury in fall in Pisces, I have two modes of operation in conflict. My Virgo Asc wants to analyse, discriminate, and ground my approach to the world by doing mundane tasks, and taking a more productive approach. Whilst my Mercury in fall in Pisces, doesn't think too much about the mundane world and all the little details in life, that by necessity has to be attended to. I tend to forget to pay bills, make phone calls, go shopping for food (my cupboard is empty, send food parcels my way or better still some money
). My Mercury in Pisces thinks idealistically, whilst Virgo is in the here and now, and has the ability to "focus" on what has to be dealt with at this moment, not later or tomorrow when Mercury in Pisces finally gets round to the task but then forgets to do it
.Virgo prioritizes things sorts them into order.
Pisces likes to swim in a stream of unconsciousness, living in a more symbolic world, it analyzes the dream world, Mercury in Pisces can fantasize a LOT but not always make reality out of their dreams and ambitions. Mercury in Pisces can get confused and muddled in thinking, and suffer from a loss of direction in life. Interests lie in the unseen world like psychology and the spiritual realm, or creative writing etc. If an individual with this placement (ruler in fall) works hard at bringing some of this inner tension into mutual balance then we have the practical healer, or the spiritual writer, or dutiful nurse etc. All plays on the Virgo/Pisces theme but it really depends on the rest of the chart for full synthesis.
When the ruling planet falls in it's opposite sign, then it creates the same kind of tension as if in opposition. Take an Aries Asc who's ruling god is Mars a planet which takes immediate action, acts independently, takes care of themselves etc. Now place the ruler of this Aries Asc in Libra, now we meet someone with a conflict between acting independently, and taking other people's needs into consideration. Mars in Libra can be more indecisive in this sign and less direct. Yet Mars in Libra acts very well when acting on behalf of others, like in law firms or any job fighting on another's behalf. Or sometimes Mars in Libra can have others act for them rather than taking action themselves. So again if the individual resolves the inner conflict than we might have here a very good independent advisor or confident negotiator.
I have only covered ruling planets in fall, but you can probably work out how the rest of the detriments and dignities work. All I would say is this type of placement from a personal perspective creates tension that needs release, which can be a productive thing, if the person works at resolving the inner conflicts within their nature.