self explanatory title, mine is the one that summons a roulette wheel.

none of them they all put me through hell so far :(

Favorite I guess I would say I enjoyed beating up STREGA the most. The bosses in the love hotel were pretty interesting too.

strega were weak, first fight against them on my first play through i defeated them both with one move(odin and take-mikazuchi's fusion tech)

Nyx

 
 Of course Elizabeth..because other than her,none of any other bosses even give me a tickle.At least Elizabeth manage to kill me 1 time out of my 15 attempts against her in hard mode.
 
Nyx is a stupid joke-none of my party cast healing spell in the whole battle.No Soma is used.Just ask other members to full assault.It died just within 8 minutes.
Other than Nyx and Elizabeth-use Armageddon or Rush to finish them before they can do first attack.