An orphaned girl from the slums of Acryn who grew up in the Right Path orphanage and since has lived on her own. She's a Wayfinder, but not registered with the Guild.
Following magical experimentation by Binding mage Lhasya Esdras, in which she was somewhat suppressed to make her more susceptible to being puppeted, Tuireann took advantage of the opening to take over her somewhat. The Binding was undone, but the dragon may still have some influence over her.
Since Walker isn't exactly an unusual name, it's not particularly clear whether she is of any relation to any of those other characters who share that name.
Currently in a slightly awkward relationship with Selphina Reese, who was similarly possessed by Tuireann but had that fixed.