I think that, on a general level, the term is indicative of characters who deal with problems that exist on a City-wide level at maximum, rather than a nationwide or planetary or interplanetary level. A street-level character might battle corruption within city government, or a mob kingpin that controlled the underworld of a given area, but wouldn’t be involved so much with conspiracies to overthrow the US Government or threats from beyond the stars and so forth.
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