Here's my finalized take on a Jevil in Spamton's role, MIDus!

He's of course inspired by Junkil, but instead of a radio show host turned scam artist or whatever, he's a forgotten radio host who still thinks the show is running and acts the part; a play on Jevil's ideas that everything is a game. He hosted a show with his co-host Spectre, and was quite popular. Until slowly, the things he was speaking about, and to the audience started becoming more and more insane and confusing. Things that didn't make sense, yet still made all the sense in the world at the same time. He was eventually thrown out mid-show and banned from being near the premises, at the order of Spectre. Still thinking the show is on, he resides in an alleyway in the Code Kingdom, visited by Spectre occasionally, though at arms length. He doesn't have alterier motives like Spamton, moreso just wanting the show and the spotlight to be on him always, and what better spotlight than the massive carousel in the center of the city?

For reasons I won't share right now, I'll just say that he actually joins Noelle as a companion for his sidequest. He rides on her back cus he's short, and let's just say even after the fight, he doesn't stay as just an item.

His name is a combination of the word "MIDI" and the suffix "us". The MIDI part is because his Lightworld equivalent is an old broken MIDI file on Papyrus' computer. That MIDI file being an abandoned piece known as "Papyrus' Cool Song". The Battle Body he gets later on is from an ms paint on Pap's computer of his "Ideal and superior policeman uniform". However unlike another universe, there are no strings attached! Those went to the other guy. The "us" I think is pretty obvious.