So, there are different variations of them, they were incarnate several times through the centuries...
Some known mutants and X-men were part of them.
The four horsemen are: death, famine, pestilence, and war.
In age of apocalypse at some time, the horsemen were replaced by "ministers".

My questions:

1- What are the differences between the four horsemen, in other words, what makes death "death" and not "famine"...?
2- If a mutant was transformed into a horsemen how he is chosen to be death and not famine or etc... And how is he transformed. Like what he gets. (I understand he will get more powerful but how it is done depending on the category; death famine or else...)
3- What are the differences between minister and horsemen?
4- And finally who do you think will be the horsemen of apocalypse in 2016 movie? (A poll will be added just for the fun of the polls.)

Feel free to add more info or to ask questions about this subject. So we can have a better understanding about apocalypse and his horsemen/ ministers.