The characters are:
Agent K
Agent J
Agent L
Agent X (this guy was from the cartoons only)
Chief Zed
There are two versions of J and L, trying to emulate their movie and cartoon appearances. It's mostly just a hair change, to be honest.
Place the file on C:\Users\Username\Documents\My Games\XCOM2\XComGame\CharacterPool\Importable
I would recommend using that one mod from the steam workshop that allows you to put civilian clothes on your soldiers, so they can wear suits, but I hear that mod causes a lot of problems, which is why I'm not using it myself.