Sergeant Wu is a fictional police officer and one of the main characters from the NBC television series Grimm. Played by actor Reggie Lee, he was introduced in the pilot episode of the series and was credited in every subsequent episode.
When Nick Burkhardt was first awakened to his calling as a Grimm, it was quite a shock for him. After seeing an angry perp named Cecil in his true form, he was so distracted that he nearly collided with Sergeant Wu in a corridor. 
Sergeant Wu was one of the first officers to respond to a breaking and entering at 1534 Wilder Road, which was the home of the Rabe family. When the case evolved to include a missing person and possible homicide, detectives Nick Burkhardt and Hank Griffin were called in to interview the Rabes. Sergeant Wu was surprised to see them show up at the crime scene. 
- Although Reggie Lee is one of the billed cast members of the series, Sergeant Wu actually plays a very minimal role in the show.