VI is really an amazing game, Kefka is, well, Kefka. SNES games are love.
Aside from story and gameplay I just want to mention something, I saw lotsa peeps mentioning FF tactics, that's a game I really would like to play, sadly I haven´t, but I mention it because the game was made by Yasumi Matsuno (director) and Akihiko Yoshida (artist), those guys are amazing, every game they make is gorgeus (they later did FF XII).
If you want to check guys that are icons in the game industry please do check both of them works (they usually work together).
note: Yoshida also did designs and art for Nier: Automata if anyone's into more recent games.