Grenadiers served within the Royal Naboo Security Forces, identifiable by their red attire, akin to that of the Queen's Palace Guard, and were primarily armed with ion grenades. In contrast, thermal detonator troopers utilized mortars to launch thermal detonators.
These grenadiers participated in the Invasion of Naboo events of 32 BBY, specifically during the Fall of Theed, where they fought alongside Jedi Padawan Obi-Wan Kenobi against the forces of the Trade Federation Droid Army. A specific grenadier is noted for providing Kenobi with several ion grenades for use against an Armored Assault Tank.
In the 2001 video game Star Wars: Obi-Wan, grenadiers are featured as non-player characters on the allied side. One of these characters has a speaking part and is integrated into a side mission.