Mimicry

Polyglots
We know from Sophie's linguistics mentor, Lady Cadence, that Polyglots can learn to mimic. Other elves can also learn to mimic.

Elves That Can Mimic
Keefe- He proves that he can do uncanny impressions of varios elves, includng Sophie Foster, Lady Gisela, Magnete Leo, and Dame Alina (Counciller Alina, as of Everblaze).

Lady Cadence- She mockes Sophie Foster during her class, using diffrent voices.