Liam Plecak, named Backpack by Airy, is a male contestant and the main protagonist of the first and second season of ONE.

He was one of the six contestants that were teleported to the Plane in the first episode, Freefall. He was a member of Team A alongside Bryce, Texty, and Stone up until Scatterbrain, at which point he was the final contestant on the team and the last one to be voted off, marking the first and only time a team is disbanded through the elimination of every single contest.