In chapter 1 of The Time Machine, a reader might infer that the Time Traveller's guests are flat characters because they lack specific names.
Flat characters are minor players that serve a supporting role in the narrative and are employed to advance the plot by subtly revealing information. These characters don't significantly develop or evolve over a novel. They are also referred to as "static characters" or "two-dimensional characters."
Since, flat characters do not have much significance and they act as supporting characters only, in chapter 1 of The Time Machine guests are not given names but called as "guests" only.
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