No MM pets are female, which is a little odd I think. 
No Females in Posse either, and they all look like the first tier pets of Thugs without 2nd enhancement.
I think there is 10 in a posse all together. Never really counted. Think 5 posse with pistals and 5 with bats/fists.
(My Thug/Dark MM is only lvl 24) 
First Question:
All the thugs are male, altought their male appearence is random. It will change anything you summon them. Different skin colour, color clothes, and the like
Second one:
You only get male posses, lots of them, never counted them. You'll only get same posse.
Here you have some screenies
This is my Mastermind Fruit Cocktail and his fruit army:
Fruit Cocktail Army
And this is Gang war it is random, so sometimes you get more type of one or another, but only the kinds show in the picture:
Gang War
Notice a theme there? 
Hope all that helps
Proud member of Blaze of the Immortals (Heroes) and leader of F.O.E (villains)
Heroes:
Plumber, Ice Desert Girl, Doc Goodheart, Banana Machoman, Pavattone, Penguin Shark, Sting like a Bee
Villains:
Bricklayer, Savage Dentist, Fruit Cocktail, H. Yashida, Shesinellek
My first question is about gender.
All the Thugs pets I saw was male. Are all Thugs pets male or is it random or MM related (female thugs MM gets female pets etc)?
Second one is about gang war. When you summon it do you only get male/female posse or are there huge skinned(brute like) people in there too?
Also when I call "gang war" do I always get same posse or is it random?
If possible can you post some screenies of the posse summoned or in action?
I know my questions are not that important and trivial but I am trying to make a themed character and would be very pleased if you could help.
Thanks in advance.