Walkman

Another one of Hadrian's OCs, Walkman is the rebuilt form of Discman after he was destroyed by Spark Chan. See, unlike most of the others he didn't want to fight the Mechanical Maniacs, but was programmed to. So Sparks got him drunk, fried him, and then rebuilt him as a worse version of himself.

With most of the members destroyed by the end of the Mechanical Maniacs Moments I don't think he can be considered part of the Octa. He's seen again in Series 9 with yellow detailing, but this is his original look.

As for the pic the background is based on two 80s walkman ads.