Ottis Brick was a solder in the 701st Mobile Infantry during the Bug War. He was a strong, seasoned Mobile Infantry trooper who wielded a E-pulse 88 Rifle in combat. Probably because of his level-headed attitude under pressure, his squad leader, Sergeant Rake assigned him to team up with Private Tor during their battles against the Bugs.
After Brick's unit retreated to Hotel Delta 1-8-5, he, along with Private Otter were trapped in the barracks by Corporal Griff, left to be infected by Control Bugs hidden in the body of TSgt Peck. Both Brick and Otter were infected. Later, Brick protected the infected General Shepherd from Sahara's and Dax's attack. Brick and Tor trained their rifles on Dax, but Dax grabbed them and forced them to shoot each other.
- Brick seemed to have a love-hate relationship with Tor as often he would taunt him, calling him "Fat Head" and making fun of him during meal times, suggesting Tor behaved like a pig.
- Brick also seems to be knowledgeable of machines as he and Private Horton worked on repairing a heavy gate-size door while the team took refuge at the abandoned outpost Hotel Delta 1-8-5.