A Fire Buddy is a small drone-like robot in Metal Arms: Glitch in the System that can be picked up on certain levels. The Fire Buddy is a small self-propelled device that will double the player's weapons-fire output, as it mimics the weapon the player is currently holding (with the exclusion of secondary items & weapons), and fires in synchronous with the player.
It should be noted that on Hard and Nuts of Steel difficulties, many of the crates containing Fire Buddies will become closed and inaccessible to the player. This is also the case for some levels on Normal difficulty. With varying availability across the difficulties, it can be inferred that the Fire Buddy is a gameplay balancer for players struggling with Metal Arms' rather rapid difficulty curve, as Fire Buddies only appear at points in the game where the difficulty bar is suddenly raised.