Okay I have a new choice. Rosa was bland but I guess she wasn't badly written overall for what she was.

Not like this travesty.
(SPOILER)

Even by Dirge of Cerberus standards she stands out as the most unintelligent, unlikable, unsympathetic and badly-written piece of trash imaginable. I get Vinny-Mac was in love and love makes you dumb and blind but there is no excuse for him liking her after he learns the truth about everything.

Lucrecia comes off as only slightly less monstrous than Hojo and the tragedy of it is that this was clearly not what they intended. They were trying to make you feel sorry for her.

I can safely say that Square has rarely failed so absolutely. I'd take almost any character you can name over Lucrecia.