Right now I just have it speaking in Raising Heart's voice for the system sounds. I wish she had a personality though.
Just imagine if she started opening random porn folders when idle and acting embarrassed when you catch her leafing through your stacks of incest manga. Sometimes she'd hum along with music you were listening to, or comment on stuff you're watching or reading. Occasionally she'll flare up at a retarded post on /a/ and beg you to type up a scathing reply. She'd apologize profusely if she or a program crashes. She'd start stuttering and coughing when she's about to break, her last words would be your name... fuck. That's kinda depressing.