New Character is the theme song for Breakman, later known as Protoman. The tune consists of a single high frequency voice along a memorable tune.
The song is usually cut short when you encounter Protoman in the various levels, but if you pause the game when the tune beings, you can hear the full version. The Ending track utilizes the theme and adds onto it.
The track appears on the official soundtrack album. It is track 18 in the NSF file.