i have the US version so i don't know what pennance is i've only seen pictures looks hard as for dark aeons don't have them either sounds hard.
so her is a list
categories |US-----------------------------------other
hardest |Nemesis, Pennance
best looking |Jecht, Pennance
funniest |Sinspawn Gui, Sinspawn Gui
weirdest looking |Yunalesca, Yunalesca
most disapointing |Seymore, Seymore