Personally, I like the first KH game's secret boss and mainly the fact that there were several of them to choose from and I think they should bring it back. Now, I know this topic has been done before, but please just work with me: Which character would you like to see in KH as a secret boss? Personally, I would like to see:
Genesis Phapsodos (Crisis Core): His wanting to be a hero has actually caused him to attack a real hero (Zack Fair), and this could easily translate to Sora.
Kadaj (Advent Chlidren): This could signify that Cloud did win the fight W/ Sephiroth, and personally I'd love to see what the KH team would do for that battle.
Yunalesca (FF X): I don't even know how it would work storywise, but I'd like to see it.
Trance Kuja (FF IX): Mostly because I just like the character.
The 'Phoenix' (Fantasia): Because It just looks awesome and I think it would be interesting to fight because you obviously can't just run up and hit it.
Genesis Phapsodos (Crisis Core): His wanting to be a hero has actually caused him to attack a real hero (Zack Fair), and this could easily translate to Sora.
Kadaj (Advent Chlidren): This could signify that Cloud did win the fight W/ Sephiroth, and personally I'd love to see what the KH team would do for that battle.
Yunalesca (FF X): I don't even know how it would work storywise, but I'd like to see it.
Trance Kuja (FF IX): Mostly because I just like the character.
The 'Phoenix' (Fantasia): Because It just looks awesome and I think it would be interesting to fight because you obviously can't just run up and hit it.