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Etta is very friendly, affable, bubbly, and talkative, as well as an adamant advocate for female suffrage and equality. Hence, she took an instant liking to Diana Prince when the latter naively compared the job of a secretary to slavery, which Etta seemed to interpret as Diana calling out the inequality of genders at the time. Etta notably also seems to adore her employer Steve Trevor, as she embraces him upon learning of his survival, and he trusts her completely, even when it comes to carrying out unusual tasks, such as carrying off Diana's Amazonian sword and shield, and instructing Diana on some female etiquette hacks.
Etta is also quite tactful, patient and improvisational, since she didn't hold Diana's naive social blunders against her, awaited without complaint as Diana tried on numerous potential outfits, and quickly used the Godkiller sword to stop General Ludendorff's spy in his tracks when he attempted to run past her. Etta could occasionally, however, be somewhat naive, which allowed the disguised god Ares to rather easily deceive her into thinking of him as an ally.