Not sure, in the Primary Design Document (now deprecated) - at one point pretty sure Etheryn was listed as a Trap (i.e. a boy). We don't have access to the Version History of said Document, but there is still something that possibly points to Etheryn originally being planned as a Trap (not a "Shemale" / "Dickgirl").
Primary Design Document:
https://forum.fenoxo.com/threads/event-writers-guide-old-and-depricated.13037/
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https://docs.google.com/document/d/14EZI8E6auc03Yf_OjvvUadfba0UT7qSvZOedjJdTFpc/edit#
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Can't go back to the Version History, but based on this - one can presume there's been at least 8 Revisions.
https://docs.google.com/document/d/14EZI8E6auc03Yf_OjvvUadfba0UT7qSvZOedjJdTFpc/edit?tab=t.0#heading=h.69uzhyd59k2m
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Something that still exists that does possibly point to the original plan being for Etheryn to be a Trap:
https://forum.fenoxo.com/threads/the-companion-conundrum.12939/
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Thread by TOBs, so should be credible. Also funny how TOBs' Title on the Official Forums is FoE Mod - when he seems to dunk on FoE with Savin all the time.
https://forum.fenoxo.com/threads/the-companion-conundrum.12939/#post-234159
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We're specifically referring to the 3rd post in this Thread (also a post from TOBs).
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https://docs.google.com/spreadsheets/d/1d3Rv_2Rm16Olcp4u1J0u2zzfTUQJkEgjlTdeNyIV-f4/edit?usp=sharing
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Etheryn is still listed here as a Trap (along with Berwyn) - not a "Shemale", like Sheinnai (a Companion that seems unlikely to be added to the game).
This at least implies that the plans may have potentially changed for Etheryn (and other Companions).
Would be nice if we could 100% validate with a previous Version of the Primary Design Document though.