What, me applying a character while on vacation and then finding a way to steal wifi from another condo in order to intro her? Of course I wouldn't do that! *cough*.
This is Mona Selwyn, full name Desdemona. She's the daughter of an Irish wizarding family that is almost as old as the Blacks. Their downfall in society is the whole Irish bit, and that during the potato famine they went broke. Her grandfather rebuilt their gigantic fortune by inviting the wizarding radio and owning two of the biggest stations and her father (Hamlet Selwyn) furthered it by making deals with the NAA. She's about to graduate as a Slytherin, and she's just as slimy as one would think. Manipulative, social climbing, power hungry and far too clever for her own good Mona would love to marry up into the NAA ranks or even old pureblood family (watch out male Blacks...except Sirius. Because he's a dirty traitor).
Right now, she's slated to be Gellert's new personal secretary and her brother (Hamlet Jr.) is in the NAA as well. She doesn't connect with people very well, but has the ability to make you think she's just a harmless, adorable weak minded woman. Random fact, but she's the Selwyn in possession of the Selwyn Locket that Umbridge had in the books.