Hello everybody! We have tons of new awards for the new year that can be requested through our Awards System thanks to Antifa Lockhart! Some are limited-time awards so go claim them before they are gone forever...
No no, Terra didn't choose Riku to have Ven inside him, he chose Riku to weild the keyblade, that's all. My guess is that since ansem the wise said that the world is always saved by a boy with a keyblade Terra decided to leave it to Riku.
I've heard this theory online before but, i think the room of awakening that Xemnas was seeking out rests within Sora, it would explain Roxas looking like Ven, a reincarnation of sorts