Mars in Aries, first through the door
Mars in Aries means you go after what you want directly and at once, with no gap between wanting and moving. Your anger arrives fast, says exactly what it means, and is gone before the other person has finished being offended.
Mars is the planet of drive: how you chase things, how you fight, how you act when the pressure is on. In Aries it's at home, because Aries is the sign Mars rules. That doesn't make it better than any other Mars. It means the planet works in its plainest form here, with nothing filtering it.
Act now, plan on the way
You start things. You put your hand up before the question is finished, you book the flight and then check the dates, you send the message while the thought is still warm. Waiting feels physically wrong to you, like standing at a green light while the car in front doesn't move. In a group you're the one who says "fine, I'll do it" while everyone else is still discussing who should.
Competition wakes you up. Give you a race, a deadline, or someone who says it can't be done and you're at your best. Give you a long project with no visible finish line and you lose interest around the second month. You'd rather run ten short sprints than one marathon, and you like your exercise the same way: hard, quick, and with a clear result at the end.
The short fuse and the short memory
When you're angry, everyone knows. Your voice goes up, you say the thing, and then it's over. You don't sulk and you don't keep a list. The trouble is that other people do. You've moved on by dinner while the person you snapped at is still replaying it two days later, and they read your cheerfulness as not caring.
The other cost is the unfinished pile. Starting is the reward for you, so the middle of things, the admin, the follow-up email, the second coat of paint, gets left behind. People who work with you learn to hand you the opening and someone else the finish.
What the rest of your chart does to it
Your Sun and Moon decide how much of this fire reaches the surface. With a Sun in Aries as well, the whole personality runs on Mars, and people meet the impatience in the first five minutes. A Taurus or Capricorn Sun puts the drive on a longer leash: you still want it now, but you'll wait if the plan is good. A water Moon makes the anger fast and the hurt slow, which is a confusing mix for the people around you.
Mars usually stays in a sign for six or seven weeks, but around its retrograde, about every 26 months, it can sit in one sign for six months or more, so some Mars signs are much more common in certain birth years. The Mars sign guide shows how to find yours. The opposite placement, Mars in Libra, makes a useful comparison: the same drive, routed through other people.
Questions
How does Mars in Aries show anger?
Fast and out loud. You say what's wrong right away, and the heat burns off quickly, sometimes before the other person has caught up.
Is Mars in Aries strong?
It's Mars in its home sign, so it's direct and undiluted. That gives you speed and nerve, and less patience than most.
What is Mars in Aries attracted to?
A chase. You want someone who matches your pace, answers quickly and doesn't mind a bit of friction; too much hesitation and you lose interest.