As what's been said. In the past, I've attempted making my own custom followers for other games, but to do it properly is literally months, maybe even years of your life dedicated to it. For most people, me included, the time requirements just aren't worth it. With the ones I have played, my only gripe is that it's too easy to get the custom companions to follow you. On a side-note to this topic, I think there should be a new category. One for Vanilla Companions and one for New Companions, because I have spent quite some time sifting through vanilla companions that have altered looks/genders looking for custom/new ones.