How to Get A Second Companion
Go to the local church in Edgewater to find a strange companion. This guy will only become available after you have repaired your ship, but if you finish all the steps of his heretical quest, he will join you onboard the Unreliable.
After Leaving The First Area, Equip Two Companions And Select Perks Geared For Survivability: Your companions become a lot more useful after leaving the first area. When they level up, select perks to make them tougher —- more HP, armor, etc. It is recommended to bring both of them, and equip them with the best possible armor. You will be surprised by how much easier it is with your companions around.