The key thing is not "these names are too silly to include", it's "these characters clearly don't exist outside of these names being used to service a joke".

Tette Cetera and Neruneru Nerune are both terrible examples to compare because they both exist in the Venomania novel and have a small impact on the plot, with social status and occupations and everything. As for the others that don't show up anyywhere, their names are punny, but they aren't clearly just a vehicle through which mothy can spell out a secret message.

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