My newest series (I hope (series-in-series??)) features a group of characters called Linglings. I haven’t fully figured out what they are yet, but each character has an idiosyncratic way of speaking that refers to their name. I decided it would be a series-in-series so I could continue using the characters.
For example, Hype always uses hyperbole and massively exaggerates her words. However, her friend Litote prefers to do the opposite