Helisma Derington is a tranquil mage who becomes the Inquisition's head creature researcher after it moves to Skyhold.
Background
Little is known of Helisma's life before she was made tranquil, only that she loved animals which lead to her current profession, and that the time leading up to her Rite of Tranquility was emotionally trying.
Inquisiton
After Corypheus' assault on Haven, Minaeve if she survived steps down from her position as head creature researcher and passes it on to Helisma. Helisma can be found in Skyhold's library, where the Inquisitor may turn in the remains of enemies for her to research. She also offers the War table operations Continuing Her Predecessor's Work and Continuing Research.