Her hands are designed that way

I’m serious; if you look at the design notes for Disgaea 3, her hands are supposed to be like claws.
To be honest, I didn’t really care much about the succubus class designs back in the first Disgaea, but when Harada redesigned them, it was a welcome change.
It’s kind of interesting how some of the classes have changed completely, even thrown out, while others have remained the same since the beginning.