The least likely is always the most dangerous
Goldbug was once a young Cybertronian drifter known as Bumblebee. He survived on the streets of Polyhex with no real purpose. Over time he became skilled at sneaking around, stealing, eavesdropping, and blackmailing. When he heard of a new cause being led by Optimus Prime, he eagerly joined the Autobots in hopes of finding a place to belong and where his unsavory activities would be tolerated. When the war began Bumblebee showed extreme bravery in battle and often sought ways to be noticed by command. In time, he worked his way up the ranks of the Autobots and when the Autobot Seeker Drench was destroyed, Bumblebee was offered an upgraded form and a new identity as Goldbug, to take his place. Although he holds a high position in the Autobot hierarchy, he is paranoid that someone will one day try to betray him and take his place as he has done to so many others in the past.