Copper Hinge is a pegasus stallion and mechanical engineer residing in Bittsburgh. He specializes in weapons and cybernetics. His cutie mark is a pneumatic assist hinge.

He uses an excessive number of vulgarities in his speech, and suffers from Systemic Lupus Erythematosus, a common degenerative disease amongst cloned pegasi. He lives with Bracket, a mute earth pony, who he refers to as "the brains behind the operation".

Lozenge's team comes to rely on him for their mechanical engineering needs.