Harper Kensington-Holt

Harper is the only female in her seven-hunter group. Her cousin, Randall, was part of her group until he died on a mission "last year", and she's been serious ever since, focusing only on climbing the ranks.

Demon in Distress is where she and her group are introduced, and it opens with her meeting a demon named Culus to exchange something for information on a kidnapped boy belonging to someone from The Mandatum. When the secret meeting goes awry, Harper is seriously injured and ends up possessed by the demon Culus brought with him.