Squall has long blonde hair, red eyes with a mole under her left eye, a beautiful face, voluptuous body and a large bust that been described as very attractive by both Ran and Ichika.
Her arm and her right eye are artificial. She lost them in an accident of maneuverability when she was in the US Army.
Squall shares a homosexual relationship with Autumn. She usually displays herself as mature, polite, level-headed and ladylike in front of other, be they friend (her squad) or other people (enemy or not). While she can be very ruthless when she want to be and doesn't mind using force, she did order M not to kill the soldiers at the American base. Suggesting that either she doesn't like needless overdoing thing when it's unnecessary or perhaps she has some other reason.
While Squall is the leader of one of Phantom Task's squads, she does have a good side to her. Compared to the cold Madoka and aggressive Autumn, Squall is willing to help someone in need because she feel's satisfied from doing so, even if there's nothing gained from it. She also cares about her comrades and will go save them if she needs to.
Infinite Stratos & AbilitiesEdit
As the leader of a Phantom Task squad, Squall is a highly trained and dangerous fighter. She has incredible reflexes, being able to deploy her IS and subdues M with it when she tried to attack her with own IS. Squall has enough confidence in her IS and skill with it that she beliieve she could match Tatenashi Sarashiki, the strongest student in the IS Academy and the IS Representative of Russia (In the anime, she more than proves this).
Squall also has a lot of connections. She was able to invite Tabane Shinonono, someone who has been able to avoid all the countries of the world, to a underground restaurant. She is mostly likely a capable strategist given her position and the number of IS her squad has.
Squall pilots the Golden Dawn IS. It is of an unknown generation.
During the CannonBall Fast, Squall accidentally bumps into Ran Gotanda. She is later shown commenting on M's abilities of holding off all six personal IS users effortlessly, before getting into a skirmish with Tatenashi Sarashiki. She is shown to be skilled enough to hold off Tatenashi with partial deployment and block all her bullets with a yellow cocoon-like shield. She confidently tells Tatenashi that the Mysterious Lady would not break through her IS but chooses to escape from the Academy instead.
After M's attack on Ichika, she talks to her about maintaining her identity and about her getting revenge on Chifuyu Orimura. A few days later when Ichika goes to a high class restaurant for a dinner with Houki, Squall shows up and helps Ichika by buying him a suit to enter the restaurant. When he leave, she introduce herself to him while saying his name (confusing him since he never introduce himself).
Thus unknown mean, Squall manage to invite Tabane Shinonono to dinner. Squall request that Tabane make IS's with cores for Phantom Task, which Tabane refused. When Squall try to force Tabane to agree (in the LN Autumn held Choloe Chronicle hostage and in the anime Autumn pointed a gun at her head), Tabane easily overpowered the two. M try intervene but Tabane just disable her IS. Everyone became shock to see that Tabane knew M was Madoka Orimura and further that she was willing to make her a new IS but had to come with her.
Squall: "Hey, M. Whether you're Orimura Madoka or not, I don't really care, but please maintain your identity as M while being a member of Phantom Task."
Madoka: "...I intend to do so until I settle the score."
Squall: "Settle the score...with Orimura Ichika?"
Madoka: "Humph...he's not a threat at all. I can kill him whenever I want to."
Squall: "So that means, with Orimura Chifuyu...right? - Orimura Chifuyu, is it? She doesn't have an IS, so I don't think she's much of a threat."
Madoka: "Don't you ever humiliate her...Someone like you will never be a match for nee-san..."
Squall: "Okay okay, I got it. So M', don't throw the knife. You'll damage the wallpaper."
Squall: "I'll go sleep for a while. Ah, M? There's still some time until the next mission, so please control yourself a bit."
Madoka: "Got it."
Squall: "I like honest kids. Bye then, M." - Squall to Madoka 
- ↑ LN - Volume 7