Kalawarner was a tall and buxom woman with long, navy blue hair that obscured her right eye and brown eyes. Her outfit consisted of a violet, trenchcoat-like top with a wide collar, a matching miniskirt, and black heeled shoes. The trenchcoat top was open at her chest, giving view to her breasts and cleavage. She also wore a gold necklace around her neck.
Kalawarner was shown to be an arrogant woman with a tendency to look down on her opponents.
Kalawarner attacked Issei after the latter's first errand as a Devil (visiting one of Koneko's regular clients, Morisawa). Although she had the upper hand, she was forced to retreat when Issei activated his Sacred Gear (in its then-Twice Critical state) for the first time.
Later on, she, along with Dohnaseek and Mittelt, fought against Rias and Akeno during the Occult Research Club's mission to save Asia from Raynare. She was terminated by Rias' Power of Destruction after making fun of Issei for how he was treated by Raynare (then as Yuuma) on their first date, which provoked Rias.