Ore no Imouto wa Konna ni Kawaii Wake ga Nai (“There’s no way my little sister can be this cute!”), based on a popular light novel of the same name, has begun airing, and is already being hailed as the top anime of the season.
Particular praise centres on the quality of animation and character design and the casting of the seiyuu.
The show even has some other characters:
The lunatic fringe apparently contains some who are not happy with the adaptation (or possibly they just realise they have no further need of the light novel):
Index vs Imouto: