Oldbag mainly comes across as a stereotypical cranky old lady. She is prone to ramble on and on when given the opportunity, lecturing others about their behavior and comparing their actions to the "good old days".  She is also very stubborn, especially with those she views as "young whippersnappers", and reacts badly to anyone bad-mouthing her crushes. 

Ideal Voice:  Honestly, anything will do, as long as she sounds old and cranky.