Kass

Name: Kazimiera 'Kass' Konstantin

Title: None

Powers and Abilities: Master thief. Armed with her invisi-tech she can literally vanish into the shadows

Hero name: Shadow, later Iron Shadow

Aliases: Ms. Konstantin

Age: mid-thirties

Infinity Stone Associated With: Ego

Summary: Kass is Sokovian, a former mercenary-thief and trained combatant who, like Natasha, struggles to come to terms with her dark past. Has always felt alone and unwanted, and started stealing at a young age. Met Tony when she hacked into Stark Industries, and their egos instantly collide. However, they have been pretty much inseparable ever since, always finding a way back to each other. She is rumoured to be the biological daughter of Ulysses Klaue.

Following his death, Tony leaves her and their daughter, Morgan, Stark Industries.