In the latest issue of Manga Time Kira Kira Carat (on sale Monday in Japan), an additional character was announced for the Kill Me Baby anime set to premiere in January:
The drawings show off plenty of cuteness, but rather than giving us her name, the fact that she was rejected/discarded (from the manga?) is emphasized over and over. We also have no idea what her relation is to the other characters, Sonya, Yasuna, and Agiri, although it's easy to suppose from her outfit above that she'll be a classmate.
Rie Kugimiya (Rise Kujikawa from Persona 4, Kagura from Gintama) is doing the voice, and hopes everyone reading Carat will also support the anime version of Kadzuho four panel comic.
It's pretty surprising that they are adding a character considering Kadzhuo has said explicitly (as recently as the afterword of the third volume) that the number or characters would not increase.