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Gaia Name: MercenaryGrax
Name: Lord Xemnas, Master Xemnas, Xemnas
Appearance: Xemnas
Gender: Male
Personality: As the eldest of the Nobodies, Xemnas lacks all emotion. He desires power above all else, and doesn't desire a true existence like the other members of Organization XIII seem to want. When speaking, he is calm and carries a sense of authority over his peers. At times, he tends to make long, drawn-out speeches. Finally, he is highly intelligent and knows well how to use others to get what he wants.
Weapon: Ethereal Blades
Powers: Xemnas has a large number of special powers and abilities at his disposal. He is the master of the Sorcerer Nobodies to start with. The rest of Xemnas' abilities/powers can be read here: Xemnas Details

Gaia Name: MercenaryGrax
Name: Xaldin (I do not enjoy being referred to as Captain Sideburns!)
Appearance: Xaldin
Gender: Male
Personality: As a high-ranking member of the Organization, Xaldin prefers to work alone most of the time. He has been called sadistic, cruel, and even heartless at times. Xaldin revels in the despair and torment of others. Oftentimes, he comes off as sarcastic and impatient, and this can sometimes irritate those around him. This Nobody also enjoys studying the psychological components of people's psyches. Xaldin also especially enjoys a good fight. Another little quirk of his is the fact that he absolutely abhors laziness. Should he be on a mission with one of his comrades, he will refuse them breaks. This little tidbit of information is most likely why Xaldin and Demyx never go on missions together. Such a thing would most likely result in poor Demyx losing his head...literally. Finally, Xaldin holds nothing but contempt for people that exhibit emotions. He does not seek a heart for the same reasons as the others do. Instead, he desires one for the simple reason that he may be able to do what only people with hearts can do. After all, some things can only be done by those who possess a heart.
Weapon: Lindworm
Powers: Xaldin controls the Dragoon Nobodies. His other powers all revolve around the power of his element: wind. He possesses the same Jump ability that his Dragoons have, and his limit break revolves around the wind element and his Jump ability.

More information on his abilities can be found here: Xaldin Attacks & Abilities

Gaia Name: (Lexaeus is currently open)
Name: Lex, Lexaeus, or Number V
Appearance: Lexaeus
Gender: Male
Personality: Lexaeus is one of the more underdeveloped of the organization. Not much is known about him really. Though what is known is that he is intelligent and laconic, only speaking when he finds it necessary, thus his title. Lexaeus is the most physically powerful of the Organization members. He is somewhat distrustful of the other members and is very willing to step in to silence fights between them. He is however very loyal to Zexion and readily follows any of his orders. He is considered a friend to Zexion and they are almost always seen together.
Weapon: Skysplitter
Powers: Lexaeus is physically strong but he'll still use earth at times to reinforce his attacks. He is capable of throwing his weapon into the sky and having it come back and flail about the battle field doing considerable damage. He can also toss it directly at a foe and it will act like a boomerang and come back to Lexaeus. He also has the ability to force a rock out of the ground before shattering it, leaving the pieces to fly around and damage the enemy. Like several other Organization members, Lexaeus has the ability to levitate, which is one of the few magical abilities he displays.

Lexaeus can strike the floor with such force that it tilts and sometimes even makes rocks fly up from the ground. Finally, he can strike the ground with such force that a damaging, unavoidable shock wave forms and spreads throughout the arena. Lexaeus is very susceptible to special attacks; such as Riku's 'Dark Aura.' Gaea's Gift is another one of Lexaeus's special abilities, his strength will increase ten times and he will become temporarily invincible to almost every attack. He is capable of tossing people too.

Gaia Name: The Original Goose Man
Name: Saix or Number VII
Appearance: Saix
Gender: Male
Personality: Saix acts cold and emotionless even though he remembers what it was like to have a heart before he became a 'Nobody.' He is very efficient at work and is second in command to Xemnas. He is often portrayed as a sort of shadow leader. He behind the scenes at times is looking to come out on top; over throw Xemnas as leader I guess you would say. He keeps details from Xemnas to both help Xemnas and to help himself. He is the one that relays the missions and orders that Xemnas gives to the numbers.

Saix always has a calm composure even if he is in a dangerous spot. He uses his memories of a heart to manipulate the hearts and behavior of others. Saix values his friendship he had with Axel before they became 'Nobodies.' Saix believes 'Nobodies' can't build friendships unless they had one before they became 'Nobodies.' Also if someone can't meet his expectations he doesn't care about how they feel or how much they beg for another chance, he will turn a cold shoulder and dish out some harsh words. Also one more thing need to know about Saix is that under his calm and goal-oriented demeanor he is very savage. He is cold and ruthless when dealing with an enemy. His normal calm demeanor is not seen in battles. He attacks relentlessly with no self-control.
Weapon: Lunatic
Powers: Saix is wild and dangerous in battle. The one thing you'd want to watch out for with Saix is his 'Berserk' mode which uses the moon as power. When in 'Berserk' mode his Lunatic Claymore shifts shape and produces a white aura around it which serve as extra blades. When in 'Berserk' Saix becomes beastial. His speed and strength increase greatly. He will rapidly start slamming his Claymore into the ground creating shock-waves. When he swings or throws his Claymore it will leave a wake of blue flames. His big weakness though is that when knocked out of 'Berserk' he will take significant amounts of damage.

The Nobodies under his command, the Berserkers, follow his attack style, using brute strength and a large weapon, but share the same weakness as Saïx.

Gaia Name: Yokoalchemist
Name: Demyx
Appearance: Demyx
Gender: Male
Personality: Demyx, unlike the other Organization members, has a very casual, cowardly, and lazy personality—though this is simply an act. He does have a bit of a cruel and crass side to himself.
Weapon: Arpeggio
Powers: Demyx controls the Dancer Nobodies and has power over water. He can create Water Forms of himself and even music notes. He is also able to summon forth powerful geysers to attack his foes and even send himself flying across the field to deal just as much damage. He can also create a giant ball of water to create a watery explosion.

Gaia Name: (Marluxia is currently available.)
Name: Marluxia
Appearance: Me
Gender: Male
Personality: Deceptive and rebellious in nature. Very arrogant and vain. Can be overly dramatic and talks a lot. Takes pride in his appearance. He uses his superiority over the other Organization members. He does have some good aspects like devotion and persistence to succeed in his goals.
Weapon: Graceful Dahlia
Powers: Controls flowers and uses his control to command beams of destructive energy from flower-themed minions. Bombards an opponent with flurries of petals and attacks with his scythe. Can create a clone made of petals. Creates a shock wave when he hits the ground with his scythe. Conjures dark circles on the ground that will hurt an opponent. Can teleport around. More abilities here.

Gaia Name:
MercenaryGrax

Name:
Roxas, Number XIII
But he has been called "Kiddo" and "Tiger"

Appearance:

Gender:
Male (to state the obvious)

Personality:
Roxas differs from his fellow Nobodies. He possess, it would seem, emotion.
He less impulsive than Sora, but far more quick to anger on account of his short-temper. He can become aggressive and will stand his ground against his opponent. He can also be arrogant, confident, and cocky. He isn't afraid to speak his mind, which could lead to his own downfall if he isn't careful. Like his Somebody, he has little patience for people who seem to be bending his will or trying to confuse him.
But enough of the slightly bad traits, Roxas can be happy, cheerful, kind, at ease, and carefree when in good company. (like with Axel and Xion.)
Roxas appears to be the smarter half when compared to Sora, since he isn't tricked into attacking unless angered.
Even though he doesn't have the brightest outlook on life, he still longs for that of his own; to be a normal kid living a normal life.
Although Roxas's emotional capacity isn't as vast and great as Sora's, he still has feelings and hopes and dreams, so when he's compared to Sora, it's almost heart breaking. He's never sure if he should feel upset or outright furious.

Weapon:
A plethora of different keyblades thanks to being able to use Kingdom Key.
But he prefers to use this lovely couple right here.

Powers:
In battle, Roxas also uses light, becoming a phenomenally dangerous foe. His style and power rival that of Sora's final form. He is nimble and aggressive, and it shows in his fighting style.
He can glide at fast speeds, so fast in fact that he leaves behind a lens flare, and control thirteen sword-shaped shields of light energy which can connect to form a laser array.
Roxas can levitate his Keyblades in the air and whirl and spin them rapidly, showing a great deal of proficiency and skill with the blades, and can also counter any extended combo with a more powerful one of his own, even creating a ring of damage just by twirling them in a circle.
He favors speed and strength, usually on the offense than on the defense.