Killing 2 Mynocks with one droid today!
For the DA-Speedpaint daily topic [link]
and my daily robot blog [link]
It's that droid what was seen with Boba Fett in Empire Strikes Back when Vader issued the bounty for Han Solo.
IG-88 has a fairly fleshed out back story, as many background characters now do. Once activated it killed its makers and transferred its consciousness into 3 other IG-88 models. They all then split up and became bounty hunters. IG-88B is the one seen in ESB. Interestingly IG-88A, the leader, uploaded itself into the 2nd Death Star and was about to start his droid rebellion when the Rebel Alliance blew it up.
Fun Fact: The character was built out of props from A New Hope. Its head can be seen in the Cantina scene. [link]