Plane-hopper, dimensional traveler.
No higher than C
A picture of Katya in her skintight suit:
A futuristic scanner/visor, capable of many functions including night-vision, heat vision, scanning energy and data signatures and giving readings on the environment, and much more.
Very little of her pre-Nexus backstory is that interesting as far as backstory goes. She has been planehopping and dimensional surfing for many years, and has had quite a few odd misadventures - but they are hardly relevant to the Nexus in the long run.