...yet she's probably over 100x older than I am. The irony of it all.

Actually, Hanako is only as old as she looks. The main cast of Disgaea 2 are not like those of the first game.

I just checked the tags; all this time I thought she was Raspberyl. Yes...I completely overlooked the fact that the horns were missing. My bad.

well from her profile in the dlc for disgaea 3, and disgaea infinite she pretty much stays this way for 300 years of her life

Understandable, since she wants to be like Etna.