Mr. Wu is the resident cat at The Cajun Boy in New Orleans. As it turns out, he didn't start out being a bar cat. In fact, no one knows about his back story. After Hurricane Katrina, Mr. Wu just wandered into the bar, where he was a served some cream, and the kitty just never left after that.
Link Via Laughing Squid
Things that are known, he was named after a character from Deadwood.