Plumeria shows up in Book IV Chapter 3 as the Order of Heroes encounters her for the first time. She's a dökkálfar who introduces herself as the spirit of lewd dreams—not exactly the most wholesome first impression. She puts up a fight against the group but gets beaten, and as she's leaving, she complains about how gross she finds humans while also thinking she should've brought Triandra along to help out next time.
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