Uhhh. Au. sobbing.
tl;dr: Devil Spamton Angel that just looks like that because of videogame-like corruptions (see this for example)
And of course, LORE DUMP BELOW THE CUT
Devil was one of Spamton’s Angels where he is a manifestation of his good sense in which in this setting, Spamton blames everything but himself for his downfall and misery. Devil happened because he is a corrupted pipis and ended up with weird graphics and color schemes similar to old video game corruptions, which are often compared to being satanic in nature. The devil helps Spamton get through his downfall and back on his feet as at least a pretty well off worker for the new computer/internet era. It is humiliating as it takes a lot of admission of errors and his faults and being held accountable for his actions. But at the same time devil helps Spamton, he manages to gets his own success by helping other cyber city denizens and lightners. The energy and attention he gets makes him grow bigger, to a short addison size, independent and better as he climbs up the success ladder. Spamton has a cushy job, a good potential life ahead of him but not learning his lesson and somehow being shadowed by a mini demon version of himself that never went away because of a strange glitch makes him deeply unsatisfied, angry, bitter, etc and begins to plot against Devil to get rid of him now that he's well off and be on the limelight again. Devil knows of what’s coming, he wasn’t stupid, so he uses his corruption powers to modify his own code to create an autorun script for when he is inevitably killed by spam and have all his info absorbed by him. At this point he is influential but he isn’t strong like a whole darkner. (The minitons in my hcs, have their data always return to spamton once they are terminated, but spamton is in control and gets it all of their memories and experiences, and has no safety measures because this isn’t supposed to happen) So the script he makes basically formats and expels all of Spamton’s memories and "soul", and the only thing in his system becomes Devil’s code. As a result he basically got the vessel and became a solid darkner individual. He basically vomited spamton dust and put it in a jar as a bragging piece. Devil is all that he talks about, he gets his job done and is confident about it, probably the most stable guy in the room because he literally killed all his insecurities and bad habits/issues in the strangest of senses. He's the opposite of spamton, and killed his worst flaw while also being his own person He’s also a tad narcissistic but in a healthy amount(because people can be full of themselves and still good), He knows his own flaws too and knows that if he fucks up he'll own up to his mistakes hile knowing his own worth. I thought it was interesting to subvert the ‘angel good’ thing and make him straight out a dude who gets things done by being direct and holding people accountable for their mistakes. It may be a punishment to some, but in the end it gives you opportunity to be better and move forward in life and past your fears.
.....his dialogue sounds like the devil from shadow fandub. (not voice completely though)