A changeling is a person with one human parent and one faerie parent.
In childhood, changelings are indistinguishable from ordinary humans. In adolescence, however, a changeling's faerie ancestry begins to express itself, and the changeling starts to exhibit faerie characteristics in line with his or her fae parent's nature. For example, Meryl, a troll changeling, began to display troll characteristics such as prodigious strength, uncontrollable anger, and troll-like hair coloration.
At any time, a changeling can choose to fully embrace one side of their nature, becoming either fully human or fully faerie. Until the changeling makes such an election, he or she is are under the rule of the Faerie Court to which his or her fae parent belongs.
In the seriesEdit
At the funeral parlor where Ronald Reuel is laid out, Dresden Listened—they heard Dresden's fair, but they're scared of him. When Dresden finds them in the alley, they toss him into a trash bin and run. Later, Meryl and Fix (sans Ace) apologize for earlier and hire Dresden to find Lily. Meryl and Fix go with Dresden and the Alphas to save Lily in the Valley of the Stone Table.