Aside from the sets of permanent characters that a person is allowed to have, there are also some extra characters that have shown up on occassion.
Extra Characters[]
Oak[]
Oak is an old drug-dealer that Kyle knows back in New York City. He also seems to know a certain amount of other information about people as well. He was the one that helped them find where Kyle's dad, Russel, was hiding. We're not sure if he'll appear again, but it's possible.
Major General Hammond[]
Hammond is a retired general that resides in Ohio. He was the one who took Salvation away from Sandy after she gave birth to it and had various soldiers experiment on it, regardless of their own safety. He and Jim seem to have a mutual hatred for each other.
The Gunnery Sergeant[]
The Gunnery Sergeant is a character that gave the group more information about Salvation and also gave them some large weaponry to help them with the different types of Husks that they're likely to encounter. He is familiar with Delta and has a foul mouth and something of an ill-temper when it comes to being insulted.