Johnson is the 16-year-old main protagonist of the series. He was mysteriously discovered as a baby outside of Gray's home in Sector 7. He is not very confrontational, but strives to be the best fighter he can be in order to prove himself to his commander, Scar. Johnson was never born for fighting, though, and is generally frustrated when he messes things up that he feels should be well within his capabilities. He is being bred to be a leader but is still struggling to find the path to that eventual goal.

Johnson usually carries himself with an unsure and nervous air, though this is tinted with a hint of child-like curiosity for the world he is unaware of. He is motivated by sheer passion, though often finds himself unable to be brave in the face of danger when alone. He starts the series off fairly unaware of the bigger picture, but as he obtains a different perspective, his motives and focus will change in kind.