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To me it is a tie between Kurt Zisa and Seph. Haven't played it but Xemnas from Final Mix seems even harder.AkaAxl 12:32, November 20, 2012 (UTC)

As I've yet to play any of the Final Mixes, I wouldn't know about Xemnas. As for regular, non-superbosses of the first game, I personally found Riku possessed by Ansem to be the most difficult battle in the game. To include Superbosses of the first game though, I'd say Sephiroth and Phantom are tied in the lead for me, personally.  Timelinesplitter Chaos 13:47, November 20, 2012 (UTC)

Well, back in the day, I managed to beat Kurt Zisa and Phantom at Level 100. But not Sephy ;^; Then, memory card fail. :< So, Sephy. Ice Titan is easy, except for the last bar of health, where you pretty much have to run away screaming like a little girl. - TidusTehSacrificer357 22:43, November 20, 2012 (UTC)

Well for me, it is a four way tie between Sephiroth, Kurt Ziza, Ice Titan, and Phantom for the optional bosses. But the storyline bosses are a two-way tie between Dragon Maleificent and Ursula. Yunie X (talk) 00:40, December 3, 2012 (UTC)