Sergeant Guy Cannon

The Sergeant Guy Cannon is a cannon closely resembling a Banzai Bill Cannon used by Sergeant Guy during Mario's battle against the Elite Trio in Mario & Luigi: Dream Team. Its role in battle is to have a Banzai Bill loaded into it by Sergeant Guy to shoot at Mario the following turn. If Mario does not attack the cannon, the Banzai Bill fires and pursues Mario, the player has to repeatedly press the button to escape the Banzai Bill. If Mario attacks the cannon before it can fire, the Banzai Bill explodes, causing massive damage to the Elite Trio and the active horde of Sub-Goombas.

Sergeant Guy Cannon X
The Sergeant Guy Cannon is also seen in the Battle Ring, as the Sergeant Guy Cannon X. It retains an identical function and appearance as the original version, but has higher stats.