So this is Syn. He's 7 ft tall and obsessed with synthetic body mods to the point of altering his limbs/voice box/other body parts with them to a cyborg-y extent. He got the name "Syn" because his voice is completely auto-tuned (which makes him sound like a creepy robot). He always wears his mask and no one's ever seen his face past his mouth (which he sometimes shows just to smile creepily at people).
He's really creepy and doesn't talk much, but mostly he's a giant tool. He loves fucking with people and being generally really obnoxious and hateable (especially towards his partners). He's the living incarnation of the passive aggressive internet smiley face. He communicates mostly through his face screen with messages and smiley faces, but his favorite non-vocal quip is the wave/finger wiggle.
So yeah, he's based off of auto-tuned/synthetic/electronica stuff. And Mindless Self Indulgence.