yes she was a little ridiculous there is also Margaret from Persona 4 but I havent faced her yet but she looks a touch OP as well.krazykidd said:Elizabeth , from persona 3. You have a set amount of rules when facing her and its a 1 on 1 fight. I defy anyone to play the game on hard mode , fight her and then say she isn't the hardest boss , you have ever faced in your entire life .
Non secret bosses I will mention silver Kasumi and Seth from Dead or Alive 4 and SFIV respectively these bosses had me swearing at a game more than I have done since the days of the SNES they just completely mess you up then when you finally win it always seems more like luck than skill.
There is a final boss at the end of wartech senko no ronde that I could not beat even on the very easy difficulty setting (could get close but after 2 hours I gave up) admittedly I am bad at this game but seriously even on the easiest difficulty he can still one shot you. I packed the game away and havent played it since.
I will also mention Prinny Baal or indeed any of the Baal incarnations from Disgaea I did not have enough patience to level to contend with this monster of a boss (or even reach him in some cases) its just ridiculous no matter what level you are (you want to be 9999) or what equipment you have he always seems to be able to one shot you.