I'm willing to bet that the beginning of KH3 is going to be Riku (and maybe Mickey) travelling to the Realm of Darkness to find Aqua.
Leading on to the last of the 7 Lights,Īqua. But to get to Ventus they're going to need Aqua to open the way through castle oblivion.
Considering Riku has already used his power of awakening to awaken Sora, they can only use their power on one of the three. I'm presuming that he is going to be one of them as well considering the purpose of the dangerous journey Master Yen Sid sent Sora and Riku on was to gain the power to awaken King Mickey's sleeping friends (Ventus, Aqua and Terra). Although I find it confusing that she'll be both a Protector of Light and one of the Hearts of pure Light that need protecting, I'm happy for this to happen because Kairi's just been sitting around for the whole series and I want to see her be relevant for at least one game. Kairi is an obvious one considering Master Yen Sid asked Riku to bring Kairi to him with the purpose of training her to wield a keyblade.
The first four are a given having played KH DD, I'll explain my thoughts on the other three now. In my opinion the Seven Lights are Sora, Riku, Mickey, Lea, Ventus, Aqua and Kairi.
