Alright, so I was doing Latin the other day and came across the word "terra" which when translated is "earth/land" which is a good desription of him using elements i think. And after a bit more research i found out that Ventus and Aqua (when translated from Latin) is "wind" (Ventus) and "water" (Aqua). Then i looked up Sora,Kairi,and,Rikus names (in Latin) this time with out luck. So i just googled "sora name meaning" kairi name meaning" ect and found out its japenese Sora=sky kairi=ocean and riku=land. Btw I don't know if someone figured out this before I'm kinda new here.