I'm positive you all saw this coming, but...
Gaian Name: Zeera Irisis
Character Name: Axel
Nickname: Number VIII; Flurry of Dancing Flames
Species/Race: Nobody
Appearance:

(My gawsh, I never noticed how twiggy his arms must be to fit in those sleeves... o.o)
Weapon: Chakrams; flames
Bio: Lost in time line
Additional Information: Axel is a little regretful for all the problems he caused. His goal is to keep Roxas from leaving the Organization, and hopefully keep from having to destroy other Organization members or kidnap anyone again, as well as to keep his best friend safe. Several of the Organization members are furious with him, however, because he played a part in their downfall before. Knowing this, he keeps a distance from them, and is slightly paranoid.
Theme Song: Either "Circle of Fire," by Tempo, or "Going Down in Flames," by 3 Doors Down
***oOOo***
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You probably saw this coming, too...
Character Name: Reno
Nickname: Monkey Boy (I have no idea...)
Species/Race: Human
Appearance:

Weapon: Electromagnetic Rod (EMR)
Bio: Reno belongs to a group called the Turks. The Turks work for the organization Shin-ra. Reno has more loyalty to the Turks than he does for Shin-ra, but still takes his job seriously, despite the fact that he wears his uniform rather casually. At first, he and the other Turks worked against Cloud and his comrades, but they've come to be allies through the Sephiroth incidents.
Additional Information: Not long ago, Reno lost his heart in a fight with the Heartless, creating Axel as his Nobody. However, he managed to get it back somehow. Since the other Turks, as well as everyone else, thought he was gone for good, he now travels alone, though he misses the company of the other Turks.
Theme Song: "Riraito (Rewrite)" by Asian Kung-Fu Generation
***oOOo***
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And, just 'cause no one else has claimed him...
Character Name: Sora
Nickname: Keybearer
Species/Race: Human
Appearance:

Weapon: Keyblade
Bio: When Sora was fourteen years old, his home, the Destiny Islands, was attacked by the Heartless. It was then that he discovered that he was chosen by the Keyblade. He traveled to Traverse Town, where he met Leon, Yuffie, Aeirith, Cid, Pluto, Donald, and Goofy. Donald and Goofy went with Sora to travel the worlds and search for King Mickey and Sora's friends Riku and Kairi. They battled the Heartless until reaching the source of the evil: *Spoiler warning! Spoiler warning! If you don't wanna spoil the ending, don't read the following info.* Ansem, the man who had supposedly been studying the Heartless. They battled Ansem until they reached the door to Kingdom Hearts, the door to Light. The Light destroyed Ansem, but King Mickey and Riku were trapped behind the door. *end spoiler* Sora now continues his journey to look for Riku. The rest is lost in the time line.
Additional Information: Sora was split up from Donald and Goofy after he was sent back. He now searches for all his lost friends, longing deeply for someone's company.
Theme Song: "Simple and Clean," by Utada Hikaru
***oOOo***
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(We're going to pretend for a moment that Tidus is NOT a little kid in Kingdom Hearts.)
Character Name: Tidus
Nickname: None.
Species/Race: Human/Dream of the Fayth
Appearance:

Weapon: Sword
Bio: Tidus was the star player of the blitzball team the Zanarkand Abes. His life as a star was ruined when one day a creature called Sin attacked his hometown of Zanarkand. Sin sent him 1,000 years into the future, where Zanarkand is now nothing more than a mass of ruins. He ended up on the island of Besaid, where he met the Summoner Yuna. He agreed to travel with Yuna on her pilgrimage to recieve her Final Summoning. After Yuna's journey was completed, they were separated. During that time, Heartless raided Tidus' world, and he lost his heart. However, he managed to regain his heart, and now searches for Yuna.
Additional Information: Tidus is a very sensitive guy. He's often called a "crybaby" because of it. Tidus is, however, a strong swimmer and can hold his breath much longer than most people because of his blitzball playing. His is an extremely strong kicker, and can send a ball flying at high speeds for long distances, causing severe damage to anyone in the way.
Theme Song: Either "All at Once" by The Fray, or "The Great Escape," by Boys Like Girls. Two very contrasting songs, but they fit, I think.
***oOOo***
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And just because he's adorable and I like him, and I think he's ignored...
Character Name: Demyx
Nickname: The Melodious Nocturn; Number IX
Species/Race: Nobody
Appearance:

Weapon: Sitar; water
Bio: Lost in time line
Additional Information: Being as sensitive and unwilling to fight as ever, Demyx has decided that he doesn't want to get involved in the Organization's business this time. Instead, he's decided to go on a search for his Somebody.
Demyx can control water, and create water clones by playing his sitar.
Theme Song: "Bring 'Em Out," by Hawk Nelson