Honestly, my history with KH is almost my life story as well as both are deeply connected.
You see, I'm not american nor from any country where english is the first language. So I was this 7~9-ish old kid in the mid 2000's and I had a 2 year older neighboor who really loved videogames. Through him I found out about Final Fantasy (VIII, then VII) and neither of us spoke english, but he had the magazines with walkthroughs that helped a lot.
Some time later he got a PS2 (it was still fresh here, while everyone else in the world was getting ready for the PS3 at this point) and KH1 and oh boy.. Love at first sight. I loved seeing him play and cherished the moments where he would let me play it myself.
I had a computer so I spent a lot of my free time reading everything I could find about KH on the net.
Some time later I got my own PS2 and managed to get KH2 (couldn't find 1), played it, finished it. Then I later got 1 but never finished it because the final fight kept kicking my ass.
Kingdom Hearts was not the first videogame I fell in love with (Megaman and it's interactions as well as Spyro got that spot), but it was the franchise that defined the direction my life took till it made me who I am today. I pretty much learned english by playing videogames and reading discussions online which started with KH, specially when the spin off era (days, bbs, coded) was announced.
Every single Videogame I have gotten after that was also mainly for the franchise. Specially the PSP, lol. (but I'm glad for that one, I really learned how to love the tiny thing). It also really affected my music tastes as I love JPOP and I specially love Utada Hikaru, whom I admire deeply.
I'm really glad that one elevator meeting between staff members more than two decades ago happened because it's the reason that one little foreign kid could grow into the adult I am today.