Well, my favorite boss was Xion.
And I hate 2: Emerald Serenade (stupid f***ing heartless, running all the time)
Ruler Of The Sky (The most motherf***ing you'll ever find! It throws you coins! Coins people! And to kill it you have to destroy its stupid tail
and wait to finish its attacks when you destroy one piece of it!)
After watching Kingdom Hearts Birth by Sleep (Jump Fiesta 2010) in the main page I noticed that when the Org XIII members became nobodies they added
(all of them) a "X". For example:
Dilan = Xaldin
Eleaus = Lexeaus
Lea = Axel
Isa = Saix
Even = Vexen
Sora = Roxas
Braig = Xigbar
So why do you think that happened?