Mars and Pluto Aspects
Mars and Pluto is raw will at its most extreme — drive that doesn't know how to do anything by halves, and a real capacity for both destruction and total transformation.
Harmonious Expression (Sextile & Trine)
Flowing, this gives extraordinary willpower and staying power under real pressure — this person can pursue a goal with an intensity most people can't sustain for long, and they tend to be the ones who actually finish what others give up on halfway through the effort.
Challenging Expression (Square & Quincunx)
Under tension, will can turn ruthless — a need to win that doesn't account for what it costs others, power struggles entered even where none were strictly necessary, or an anger so total it frightens the person feeling it as much as anyone on the receiving end of it.
Conjunction & Opposition — Fusion and Polarity
Conjunct, drive and power are fused — an intense, often obsessive will, single-minded once fixed on a goal, magnetic to others but not always easy to be close to on an ordinary day. Opposed, that intensity is met through others, frequently via literal power struggles or rivalries that simply don't resolve easily or quickly.
In Relationships and Daily Life
This suits high-stakes, transformative work — crisis response, deep psychological work, competitive extremes — and in relationships it means conflict, when it comes, tends to be total rather than mild, which is exhausting but rarely, if ever, dishonest about what's really at stake.
Now in order it follows, that the Astrologians do also consider the Essential Fortitudes of the Planets, the Superiors aspecially; for all those Planets that are below the Sun, viz. Venus, Mercury, and the Moon, do not occasion any great Mutation of the World, they do sometimes for a while put great Actions forward, and at other times retard them, but always without violence. - William Lilly (1602.-1681.)