Alright guys, you've gotta hear me out. Guard first appears when Terra is possessed by Xemnas during Birth By Sleep on PSP. Coincidence, I do not think so. Not to mention that dumb sh$z with Riku in DDD (Double Dippin Dreamers).
>Guardian reaches to Riku(Ryan)
>"Strength, to protect what matters"
HE SAID THAT SHIT WITH TERRA WHEN HE MET TERRA IN BBS.
But hey, it's just a theory. A game theory.