Fycie is the daughter of Rantz. She has a brother named Bugs. She lives in Rantz's Cave, and sells during Big Chompy Bird Hunting and afterwards feathers. In Recipe for Disaster, both Fycie and her brother Bugs use the ogre boat ride to get to Karamja. During some Treasure Trails, she has to be talked to. When doing so, she says 'Human done good!', and gives you your next clue, or the reward. When the player talks to Fycie, the option "Talk" appears, as opposed to the usual "Talk-To". This is the same for Bugs.
Fycie is the solution to the medium anagram clue: ICY FE.
Note that you can only talk to her within Rantz' cave to complete the Treasure Trail, not whilst she is swimming.