R2G2

 is a passive item.

Effects

 * Summons a robotic companion that follows the player.
 * When an enemy is in range, it prioritizes following the target and periodically fires a rapid burst of 6 bullets at them.

Trivia

 * This item is a reference to R2-D2 from Star Wars.
 * It's possible this reference was chosen since said character somewhat resembles a bullet.
 * The item's description is a reference to a scene from Return of the Jedi, where R2-D2 is forced to serve drinks aboard Jabba the Hutt's sail barge.
 * Like most companions, R2G2 can appear to be hurt by certain hazards such as explosions or electrocuted water. When this happens the companion may play the hurt sound that a Bullet Kin makes.