I always wanted to make my own RPG game. Ever since back I was a kid. The oldest concepts come from back when I was in the 2nd and 3rd grade. As the years went on the idea(s) expanded all into one massive game. The central idea of Kay being divided into two separate entities that are equal other than Holy/Evil alignment came around 2000 or so. My 14 year old self wondered what it would have been like if there were two of the same person, where each grew up in two different places, only one was good and one was evil. Like in Chrono Cross but the Good Arbiter and Evil Arbiter existed in the same dimensional plane. The thing is though, this idea came to me one year before I even played Chrono Cross, so while Chrono Cross is not the 100% point of origin for the game's central concept it did help me refine it.
I've been saying for quite a while now that I want to cut a ton of material from that game, keep true to the story I originally came up with, and resurrect the idea. It's still a life goal of mine, I ended up shelving said goal when adult life and other things became more of a priority. If I had the time, the finances, and a development team then I'd overhaul it and try again.