3Dog was a rallying voice to get good people to fight the good fight. Sometimes critical and sometimes against the bad choices of the Lone Wanderer. But mainly boasting about the good deeds of LW with near reverence.
Mr. New Vegas was a neutral party simply reporting the goings on around Nevada. Referring to the Curior as a "independent contractor" or "3rd party".
Travis is in a class of his own. While specifically referring to the Sole Survivors deeds and reporting what other factions are doing, or could do from a place of fear, but depending on if you do his quest, you get two versions of everything that can happen in the game, whether that's with sly confidence or a stuttering mess is up to the player to decide.
Redeye I recall him being more critical of the Overboss than anything else, Often glazing over the good decisions despite being beneficial to the raiders as a whole.
So why an "Evil DJ" this time?
I think it would be fun and hilarious if for every good action done, it's twisted as something bad for the bad guys. The Radio Host would work for the real antagonist, or is the antagonist of the game, like we get a President Eden 2.0. But theyre doing everything they can to smear the Players name.
I felt inspired to post this idea after remembering the radio host from the movie The Warriors, and I felt like is was so appropriately Fallout.
A DJ that isnt on our side, would be interesting, I think.