Now I'm actually trying to brainstorm a name for the device. It's almost the perfect hurdle between him and total global domination.
I was thinking "Animus," the latin word for soul which can also refer to "the basic impulses and instincts which govern one's actions" as well as "A feeling of enmity, animosity or ill will." Pretty fitting for a villainous mind control device. And I'll go ahead and propose that this device would amplify his abilities to become telepathic as well as giving it greater reach.
Well, is there a color you think would most suit him? Do you lean toward a minimalist or an opulent design? I'm already picturing black with elegant gold filigree stitching around the edges, and more of a suit and cape look than a wizard robe one.
It's also important that it doesn't clash with his hair color. 
That sounds good to me. Something that says "I am a class above you, but I'm not going to rub it in your face."
Well, you can't really clash with black, right? Or did you have another color in mind?
Is anyone else at all fixated enough to have created a background for their Superhero? 
Mine was a debutante from a wealthy Connecticut family until she ran away to New York at seventeen after her powers manifested, and she performed as a cellist on the streets and subways to make ends meet until she was recruited and trained properly.
I rationalize giving it as much thought as I have by my intention to actually use the concept for a story at some point. 
What? That's crazy! Who would be into this enough to do that?
...
He grew up a shy, reticent child from a lower class family under a harsh Eastern European dictatorship. As such, he would have witnessed firsthand the abuses of power and the suffering it can inflict. However, instead of yearning for freedom from that power, he began to obsess over it. It became the way for him to deal with the atrocities around him. Whenever he witnessed a terrible injustice inflicted on another, he would close his eyes and imagine himself as the dictator, coming in and saving the person with a single command.
The government eventually came for his family. He tried to get them to stop but his cries and pleas did nothing. The soldiers laughed mockingly as they shot each member of his family in front of him. Covered in his loved ones' blood and with the muzzle of a gun pointed at his head, he uttered one final word: "Stop." And that's how he discovered his powers.