Here we go again, Suikoden II, first ever RPG played, best ever RPG played(imo of course), only RPG that I played on multiple platforms(PS1, PSP, PC Emu), only RPG finished more than once(5 times to be exact), so yeah, as far as favorite RPG goes, this is "the" one. (And have I mentioned I looked like the kid in my avy when I was in highschool? no? well there you go then.)
Edit: Its importance? It shows how I feel about a memorable game that I have enjoyed more than anything else, atleast for this site.