Hello!
I'm a girl with my Mars in Aquarius.
I don't have much fire in my natal chart so this is as active and fire-y as it gets.
I'm an Aquarius rising so I even have Aquarius and Mars in my first house.
I guess it makes that I seem more straightforward and more "hard" and "dominant" than I actually am.
I often describe this part as my "strong untouchable shell".
But hey, there's a Moon in Pisces underneath (also in the first house).
I will often say things that I regret later.
I don't shy away from confrontation and discussions. I quite enjoy discussions and having a different opinion than someone.
I just like to deate.
I enjoy being rebellious and different from the rest.
I can also be quite dogmatic and persistent (not to say stubborn and petty) concerning a few topics.
Let's say I have certain points of view, certain ideologies...let it be ethical or political.
Let it be the fact that I'm a feminist or that I'm vegan or other aspects.
What some people like to call "SJW"...to me that is quite Mars in Aquarius.
Fighting for the fact that there are different genders and genderfluid people and fighting for the rights of certain people and defending the fact
that you shouldn't think or talk about certain topics how it "used to be" because there are different, new times and times to celebrate being unique.
And defending this with activism and discussions.
That is totally Mars in Aquarius to me.
I can come off as "trying too hard" and "discussing too much".
There are people who don't like confrontation or confuse it with arguments or "trouble".
To me it's fun and tempting.
I enjoy activism and I like that certain rebellion concerning things (I am also stubborn and having my sun in Taurus doesn't help there).
Note that I am usually a quiet and nice/friendly girl but sometimes there are topics where I might start a heated argument (albeit always a more or less mature discussion. Mercury in Gemini and all).