For those who don’t remember him from Guardians of the Galaxy, The Broker is a purveyor of high-end goods on Xandar, The Broker was approached by Star-Lord about purchasing the Orb (Power Stone) from him, but refused upon learning it was sought by Ronan the Accuser.
Interestingly, The Broker was also supposed to appear in Thor: Ragnarok but that didn’t come to fruition.
After that, Yondu, who wanted information about the Orb, including who was interested in buying it, also visited The Broker in a really funny scene.
He seems perfectly suited to fit in with those wheelers and dealers of the galaxy who play in morally grey areas like The Collector and The Grandmaster, but even though he missed out on that movie, there’s always Guardians of the Galaxy Vol. 3.