They rise out of the ground when approached and start firing the two pistols they possess at Crash. After a brief moment, they take a break to laugh and then start shooting again, leaving them vulnerable for a few seconds. Usually, there are spots for Crash and Coco to hide from the bullets.
The Slim take the appearance of classic gangsters of the 1930's to 1960's, similar to Pinstripe Potoroo. However, these enemies are more blandly dressed, with a blue suit, pink shirt, and red tie. They wear the signature hat of a mobster: the fedora. Each Slim holds two generic, silver handguns.
They are called 二丁銃のトミー (Nichou juu no tomī Dual Tommy Gun Wielder) in the Japanese version of the game.
For whatever reason, once Crash has defeated a machine gunner, if Crash dies, that machine gunner won't be there when he reaches the spot again. This is unlike any other enemy in the game. In later Crash games, when Crash hits a checkpoint after defeating an enemy, that enemy won't be there anymore. However, with machine gunners, even if no checkpoint has been hit after defeating a machine gunner, it still won't be there anymore. It's not known if this was intended, or if it is a glitch.
Their laughs in the N. Sane Trilogy are sped up versions of Pinstripe's. In the original, their laughs are sampled.