Pneumonia — or "Pneum" when she's in a hurry, which she often is — doesn't remember anything before meeting her best friend and honourary brother Parsnip, but that doesn't matter to her. She is only interested in the present and all the possibilities before her.

She loves exploring and experimenting, is willing to give just about anything a try, and enthusiastically dives into any situation headfirst. She reasons that Parsnip is so good at being careful that she doesn't need to bother. Despite occasionally breaking equipment due to her heavy-handedness, Pneumonia has a talent for alchemy, and regularly works on projects at the Tempest Spire. Her ideas often need more than a few modifications in order to be practical, but she's always happy to take on board suggestions from her collaborators, and her creative thinking has gotten her team out of a tight spot on more than one occasion while rushing to meet the Stormcatcher's latest deadline.

After a long day of incantations and explosions, Pneumonia enjoys relaxing in a bubblebath with the latest mystery novel, or watching a horror movie from underneath one of Parsnip's crocheted blankets.