Sam the hacker (get out of bounds)
Once you unlock Sam in multiplayer mode, select him and go to one of these maps: Little Rock, Desert Fortress, Widows Patch, Fairground, Boyhood Home, Fallen Creek, or the Coliseum. Once there, make sure you have at least one deadeye bar, grab onto a ledge but don't go up.
and once he's going, pull the left thumbstick
back, so that he crashes into the wall. If done correctly, He now is in "Cheat Mode" and can go through most walls by doing that sideways roll thing.