IG-88 was a droid assassin made by Holowan Laboratories - playable only in Forces of Corruption with the Zann Consortium. His body consists of many tools that seem to shift depending on the job.
IG-88 uses a sniper and a E-11 rifle, and dual-wields them in ground combat. Both are capable of a one shot kill, and his abilities include radiation in an area of effect and an antipersonnel blast of toxic waste. He can sabotage the Death star as well.
He is one of the handful of bounty hunters who appear in Episode V: The Empire Strikes Back.