Ok, this is what happens guys. Terra loses his memory, resulting in him thinking he is Xenanhort (the same Xenanhort Sora defeats in KH1) So essentially, Xenanhort in KH1 is Terra.
Aqua dies at the end of Birth By Sleep, trying to protect Terra from the darkness and subsequently becoming Xenanhort. In her last will of life, she transfers her soul to a small girl in Hollow Bastion who she felt had a strange power earlier in the game. That small girl was Kairi, and that strange power was Namine's ability to control Sora's memories. That power was derived from Aqua as Namine is the embodiment of Aqua's soul. This is also the reason Kairi is able to wield a keyblade since Aqua's soul is inside her strengthening her heart.
Ven is absorbed into Sora to save his soul after his body was destroyed by Master Xenanhort in that battle from the secret ending, and Roxas is the embodiment of Ven's soul which explains the similar looks and attitudes, as well as Roxas being able to wield a keyblade without a heart.
So yeah. That's BBS in a nutshell. At least main character wise.
Aqua dies at the end of Birth By Sleep, trying to protect Terra from the darkness and subsequently becoming Xenanhort. In her last will of life, she transfers her soul to a small girl in Hollow Bastion who she felt had a strange power earlier in the game. That small girl was Kairi, and that strange power was Namine's ability to control Sora's memories. That power was derived from Aqua as Namine is the embodiment of Aqua's soul. This is also the reason Kairi is able to wield a keyblade since Aqua's soul is inside her strengthening her heart.
Ven is absorbed into Sora to save his soul after his body was destroyed by Master Xenanhort in that battle from the secret ending, and Roxas is the embodiment of Ven's soul which explains the similar looks and attitudes, as well as Roxas being able to wield a keyblade without a heart.
So yeah. That's BBS in a nutshell. At least main character wise.