Heather Simmons Thompson is the illegitimate daughter of legendary CIA agent Rupert Hummel and Greek Intelligence agent Diana Manolas. Born and raised in California, she learned who her biological parents were and somehow seeked out her half-sister Portia Calligaris. She later began attending high school alongside the Darlings and became a good ally of them, often clashing with Zoe and popular girl Daphne Tomasino.

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