1000-chan
Nickname of the original mascot character "OZS-1000" made by Oizumi Corporation, voiced by Nitta Emi (新田 恵海). Had a booth at Comiket 84, selling merchandise and a music CD. Also has VN-style "short drama" videos at her niconico channel.
Official website: http://oizumi.co.jp/1000chan/
Official twitter: https://twitter.com/oizumi_koushiki
Official niconico channel: http://ch.nicovideo.jp/oizumichannel