Roxas, Axel, and Xion, the Organization-turned-friends from Kingdom Hearts, joins the band!

Axel: Organization XIII's Number 8, Axel is Lea's Nobody, commanding the element of flames with his twin Chakrams. Once an avid follower of Xemnas and his ideals, their needless brutality and his time spent with Roxas and Xion made him question his allegiance. Though he would still follow orders from the Organization, Axel will not hesitate to cast aside his masters out of loyalty for his friends.

Roxas: Organization XIII's Number 13, Roxas is Sora's Nobody, being able to wield the Keyblade as his main weapon while sporting Ventus' looks. Despite bonding with Axel and Xion, Roxas left the Organization upon realizing he was nothing more than a pawn in Xemnas's grand scheme. Since then, Roxas has retreated to Twilight Town, decarling it his home as he attempts to live a normal life...

Xion: Organization XIII's Number i, Xion is a Nobody not born in a traditional sense, instead being an artificial creation that draws power from Sora's memories. Despite her bond with Roxas, Xion recognized her role in Xemnas's plans, and ultimately sacrificed herself to save the worlds at stake.

[Roxas and Axel model from Kingdom Hearts II]
[Xion model from Kingdom Hearts: Dream Drop Distance]