Madalyn IS featured in the Genesis Order trailer. Whether this means she survives Treasure of Nadia and appears as a regular character in the Genesis Order or just appears in cut scenes looking back to earlier events I don't know. (She definitely won't be a member of any harem! No mortal woman could compete with the allure of a succubus wielding sex as a weapon for goodness sake!) As far as I am concerned Madalyn is THE stand out character of Treasure of Nadia and so I really hope she does migrate to the Genesis Order as a character and carry on wreaking her evil plans, quite possibly as the master villain... or should that be mistress villainess... of the piece.
Here's the URL for the clip:
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If the game is as good as it looks I'll sign up on Patreon as an NLT supporter again.
(It all depends how much Madalyn there is and how good or bad the story is.)