from Sakurasou no Pet na Kanojo
Maid-chan is the automated e-mail responder AI developed by Ryuunosuke. As Ryuunosuke is typically a shut-in, Maid-chan is the one responding to e-mails sent to him by members of the Sakurasou dorm, or whenever they have inquiries and Ryuunosuke is too busy to answer it.
In the later episodes, she was preventing Rita Ainsworth from being too close with Ryuunosuke, and was seen to have developed some.. bugs, regarding Ryuunosuke.
I chose her because.. she's cute. No, seriously, if ever I continued down the line with programming-related courses instead of engineering, maybe the likes of a Maid-chan AI would be the first one to be on the list of my projects.
..And maybe I chose her because she was voiced by Yui Horie.