I'm debating whether or not to give my protagonist a last name. His last name would be of no relevance in the story, so basically it's just useless information. But is having a last name, relevant or not, necessary for building a believable character?
I remember when I used to read Stephen King novels, it would annoy me the way all of his characters are introduced by their full name. "I'm John Doe. This is Joe Blow, and that over there is Peter Cottontail."
Who talks like that in the real world? It's too formal. It sounds better to me like this: "I'm John. This is Joe, and that over there is Pete."
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