Hm, most of those bosses were from Birth by Sleep with the exception of a couple.
Did you really compare them all? Was this just for 2.5?
I have yet to try most of the optional bosses in BBS, as I only just recently beat the game in 2.5. I did previously defeat Vanitas on the PSP, but I killed him with mostly land mines lol. Myserious Figure... I never seriously attempted, but I am pumped this go around as I have been clearing all the secret bosses since 1.5. So yes, I have defeated Lingering Will and I felt so glad to finally get him out of the way.
Is the Mysterious Figure still number 1 with the small nerf they did to him in 2.5?
I know this is just your personal opinion, just want clarification on things.