Minifigures
Most of the Rock Raiders have fairly similar designs between the in-game and physical versions, with a notable exception. Although the DDI Dump and marketing materials and prototypes show the crew with leg prints, none of the released figures contain them.
Rock Raider
Role: ?
Rock Raider is the standard miner featured in the Rock Raiders PC video game. It does not have a physical counterpart. Although the torso looks similar to Sparks’ torso at first glance, it’s actually an entirely different graphic. The head is a generic Yellow Minifigure, Head Standard Grin Pattern.
Chief
Role: Captain
The original plan for Chief was for him to be released as a bonus figure with the Rock Raiders video game. This plan was scrapped and the minifigure was instead released as set 3347, part of the Mini Heroes Collection.
The designer of the figure (Simeon Hankins) created a thread on Rock Raiders United where he explained the development of the figure and shared images of his one-of-a-kind prototype.
Source: Topic #9131 on Rock Raiders United
Jet
Role: Pilot
The Mini Heroes Collection: Rock Raiders #3 set featured a version of Jet with a transparent blue visor and dark gray legs.
Sparks
Role: Engineer
Axle
Role: Driver
The Mini Heroes Collection: Rock Raiders #3 set featured a version of Axle with a non-transparent black visor.
Docs
Role: Geologist
The Mini Heroes Collection: Rock Raiders #2 set featured a version of Docs wearing a backpack instead of a bandana.
Bandit
Role: Sailor
In Race for Survival, Bandit is wearing black gloves, presumably for warmth in an icy environment.
Unknown Rock Raiders
The inside cover of the Big Box Rock Raiders PC video game in the United States featured an alternate version of Jet with a red color scheme.
It also showed a number of figures who appear to have Doc’s torso and legs combined with Sparks’ helmet.
The Big Box Rock Raiders PC video game in the United Kingdom contained a booklet with some additional miners.