Bolza Grool, a Klatooinian male gorgmonger, operated on the Colossus, which served as a refueling station above the planet Castilon. Grool had a habit of tossing racers who failed to meet their obligations off the Colossus platform, headfirst. He once found himself embroiled in a brawl at Aunt Z's Tavern with Kazuda Xiono, after Xiono inadvertently hit him in the back with a holo-dart.
Grool worked as a gorgmonger at the market located on the Colossus. Upon Kazuda Xiono's arrival at the platform, Grool was in the process of dealing with a Gotal pilot who had neglected his duties, which involved throwing him over the edge and into the waters below.

Later on, while at Aunt Z's Tavern, he was in conversation with another Gotal. The Gotal spoke of someone rumored to be the best pilot in the galaxy, a claim Grool brushed off. Soon after, Xiono, the very person the Gotal had been discussing, was playing holo-darts with an Aleen named Grevel and accidentally struck Grool in the back with a dart. The Klatooinian confronted Xiono, while Grevel simultaneously tried to collect his winnings from Xiono. Grool shoved Grevel aside, but when Grevel attempted to intervene again, Grool tossed him into the arms of the Snivvian Nod. Subsequently, Grevel threw a cup at Grool, who then pushed Xiono out of the way. The cup struck a Rodian, who retaliated by throwing cups at the Snivvians Nod and Narb, triggering a massive bar fight. Grool resumed his pursuit of Xiono, pinning him against the bar until Jarek Yeager intervened, using his blaster to end the altercation.
At a later time, Grool was managing his stall at the Colossus marketplace when Xiono approached him with a proposition. Xiono offered to display Grool's business logo on his racer. Grool agreed to the deal and, in exchange, provided Xiono with a gorg. Some time afterward, Grool was transporting a box of gorgs through the marketplace. Nearby, Xiono was being confronted by Grevel, Nod, and Narb. Xiono's droid, BB-8, then used an electrical shock on Grool, causing him to drop the box of gorgs, which landed on Grevel and the Snivvians. Xiono used this distraction to escape, thanking Grool as he passed.
While Grool was carrying a crate filled with gorgs, an Ugnaught vendor, who was chasing the orphaned refugees Kel and Eila, collided with Grool. This caused Grool to lose his balance and drop the crate, resulting in one of the gorgs landing on his face. Kel and Eila later found refuge in the engineering deck, aided by the Chelidae, Xiono, and Neeku Vozo, who assisted them in escaping from the First Order.
Later, Grool accidentally bumped into the BB-series astromech droid BB-8 while navigating the Colossus marketplace. Grool sternly told the droid to be more careful.
Bolza Grool was a Klatooinian male who possessed orange skin and brown eyes. He took great offense to being mistaken for a holo-dart board and displayed considerable anger when it occurred. Nevertheless, he was open to business deals that offered advantages to his enterprise. Grool made sure to throw racers who failed to honor their commitments on Colossus off the platform head first.
The character of Bolza Grool was conceived and developed for Star Wars Resistance. Fred Tatasciore provides the voice for the character.