|“||I am frequently underestimated. I think it's because I'm short.||”|
—Kady Grant, ILLUMINAE: The ILLUMINAE Files_01
|“||I want you to remember that I have a history of disobeying your direct orders and turning out to be right.||”|
—Kady Grant (to Syra Boll), GEMINA: The ILLUMINAE Files_02
Kady is shown very early on to have a rebellious streak, after purposefully failing certain tests conducted by the crew of the Hypatia to avoid being forced into service. She is very ambitious and knows what she wants to do with her life. Kady is also incredibly stubborn and can keep a grudge for a long time before finally forgiving someone. However, her and rest of the survivors are almost always stressed for time, meaning she has to quickly make up with whoever she's fallen out with. She excels under pressure and always seems to put herself in danger for the good of others, despite being described as "not a team player." She would also much rather work alone and get the job done, though she is willing to work with close friends, which seems to happen a lot.
Kady's most defining feature is her bright pink hair, that has slowly grown out to show her brown roots throughout the series. She has blue eyes and is also very short. She claims her height makes people underestimate her. She is described as very pretty, though not many of her other specific traits are identified by Ezra or security footage.
She is identified as having dyed her hair back to an inconspicuous shade of brown at the end of Obsidio.
|“||You deserve someone who'll run with you as far and as fast as you want to. Holding your hand, not holding you back.||”|
—Ezra to Kady
Kady and Ezra were dating when they lived on the Kerenza IV Mining Colony, but ended their relationship very shortly before the colony was attacked. Kady initially breaks things off because Ezra does not have a plan for the future, which bothers her greatly. After the Kerenza colony is attacked, Ezra is sent aboard the Alexander and Kady boards the Hypatia. Ezra makes several attempts to contact Kady, but his communications are ignored, as Kady is still holding a bit of a grudge and can't really find the right words to say to him. Eventually, the two start to reconnect when issues begin arising with the Alexander and the Lincoln looms closer.
|“||We were meant to finish this together.||”|
Kady considers AIDAN her enemy during most of her stay on the Hypatia, thinking of it as an AI gone mad. AIDAN pretends to be Ezra to lure Kady to the core servers of the Alexander, and then tells her Ezra is dead to get her to cooperate with it. She strikes a deal with it to help the remaining, healthy members of the Alexander go to the Hypatia, if she would stay and repair it. They slowly grow closer in the time before the Lincoln arrives, and when the Alexander is mostly destroyed, she consoles AIDAN as it leaves the bulk of its data behind. In Gemina, she is shown to be supportive of AIDAN, allowing it to use the Hypatia's systems to resolve the multiverse paradox.
In Obsidio, their relationship grows to be a strong friendship. After AIDAN kills two thousand of the Mao's population for "population control", though, Kady feels betrayed and angered at its decision and shuts it down. For the majority of the book, even when the AI is brought back to save Kady and the rest of the the Illuminae Group from Garver, Kady is angry and doesn't feel like talking with it. When AIDAN sacrifices itself to destroy the BeiTech ship Churchill, Kady feels regret and begs for it to not leave. It tells her that it loves her, but before Kady has a chance to respond, it is already gone. She never sees it again for the rest of the trilogy, though AIDAN makes a final appearance at the end of the book. It claims that it is survived from a few lines of code planted on a BeiTech ship and that it is drifting between servers, and that it misses Kady.
- Kady is fond of the Super Turbo Awesome Team.
- Kady's IQ is 147.
- Kady's age in days is 6421 days.
- Back when they still lived on Kerenza IV, Kady used to wear Ezra's t-shirts to bed frequently, so often that she can now recognize his smell.
- Kady is a fan of the singer Lexi Blue.
- Her first date with Ezra was a game of 20 Questions, with Kady's father participating as well.