The Fat Man
From Wookieepedia, the Star Wars wiki.
The Fat Man was a greasy, scar faced individual with small eyes and rotund build under the employ of Jabba the Hutt. He was the audience for Arica's audition as a dancing girl and in the end hired her for the Hutt.
Seen as a petty man who enjoyed what little power he wielded, The Fat Man tried to impress people with his 'Important Person' routine where he boasted of how he was used to protect Jabba's anonymity by being sent out to meet with people. This in turn caused some on Tatooine to believe he was actually the crimelord himself.
Mara Jade, who was posing as Arica to infiltrate Jabba's Palace, saw this as backhanded compliment. Though he was considered trusted enough to finalize the Hutt's deals he was also perfect 'assassin bait' and therefore expendible.
[edit] Behind the scenes
The description and actions of The Fat Man in the short story he appears in implies he was intended to be a retcon of Declan Mulholland's portrayal of Jabba that was cut from A New Hope before the scene was later reinserted with a CG Jabba into the Special Edition.
If so, he could also possibly be Opun Mcgrrrr from short story Spare Parts whose likeness was also taken from Mulholland.
