A few of my headcannons about the Major (I've been thinking about this for almost two years, kill me, I'm sick of this fat man)
He had the same family as in the Coyote. His mother is a prostitute, his father is an alcoholic. The devil knows how he managed to survive in such conditions, perhaps life had its own plans for him.
At the age of 14-15, his father died in front of his eyes, and he decided to finish off his mother with a pistol along with her other lover.
Due to the fact that Max saw his mother under other men, he had an aversion not only to sex, but also to close relationships with people in general. So he never had friends, lovers, and so on. All this is alien and disgusting to him.
The Major has no complexes. he literally doesn't care what he looks like and he just does what he wants. But despite this, he does not allow himself not to take care of his appearance and does not tolerate sloppiness in other people. Even in his army, all soldiers must be in perfectly pressed uniforms, with polished weapons and so on.
All the soldiers in his army are nothing more than expendable and he does not disdain to use them for his own purposes. The major likes this power, he likes to control everything. Sometimes he compares soldiers to pieces on a chessboard.
In his spare time, the Major reviews recordings from the battlefield and gets quite a lot of pleasure from it, listening to the screams of the dying and seeing all sorts of atrocities.
Despite his coldness towards other people, Max loves animals, especially dogs. He likes the way dogs can blindly follow their master's orders, happily receiving treats or praise.