Cinder's Faction

Cinder's Faction (unofficial) is a group of antagonists appearing in Volume 2 of RWBY. Members from Volume 1 include Cinder, Roman, and seemingly the White Fang. Other than Emerald Sustrai and Mercury Black, the identities of other members of this faction are currently unknown. The details known currently are that Cinder is directly in charge of three subordinates, including Roman Torchwick, and in addition exercises a significant degree of control over the White Fang; the nature of her role within this faction is otherwise uncertain.

What Cinder's goal is remains to be seen, but her methods are clearly brutal as seen in the fact that her protégés, Emerald and Mercury, happily killed a former member of the White Fang when they learned he was trying to leave for Vacuo. Whatever her agenda, it seemed to entail the collection of Dust as Roman had used his acquisition of the material to excuse the fact that he hadn't dealt with Tukson personally. However, as of the start of Volume 2, Dust seems to no longer be part of the equation.

The Volume 2 Trailer shows Roman and an unidentified girl with three-toned hair unveiling a stolen Atlesian Paladin to the White Fang, already bearing White Fang livery. This girl is later to be revealed as Neo. Her rank within Cinder's Faction and/or the White Fang is unknown.

White Fang
It is seen in Best Day Ever that the White Fang are clearly working under Cinder's direct orders.

Trivia

 * When Emerald and Mercury's names were finally released, the first assumption was that they, together with Cinder and Roman, would be named Team CREM (cream). Another popular arrangement is CRME which is typically read as crime (not a color) but the abbreviation could also be read as chrome which can denote a reflective silver.
 * When Emerald's surname was revealed, the team name became workable as CRMS (crimson in allusion to Cinder's fan-made alias created at the start of Volume 1). The inclusion of Neo further cements the possibility of this being chosen as a team name (CRMSN).
 * As Monty has said Emerald and Mercury come from other team(s), most fans have since given up finding a common thread to rationalize Cinder's Faction as a team.
 * The Volume 2 Opening seems to indicate that the "Three Bears" are somehow in league with Cinder as well.