but then i'd be a nark

The more you read Scott's work the more you'll run into his love for the multiple designations he gives his characters.  Many nicknames are used for characters and are usually the result of one character giving another the nickname.  In this case however, you've run across Scott's penchant for weaving sarcasm into some of his characters.  There is no charcter named Narkie Narkerson...it's merely a play on the word narc.  Hope this helps.
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Gmork - Wiki Czar and Thwackacutioner

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Head Biker Babe of the Chang Bangers Bike Club, Dead Sexy Dealer, The Juicer & Co-Founder of the Gutter Sistren
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It's a conversation between two characters. So the one using the name is talking to the person he refers to as "Mister Narkie Narkerson."