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 you can hear the full song by pausing them game when the tune begins. 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.