• Gerard Way – lead vocals (2001–2013)
• Ray Toro – lead guitar, backing vocals (2001–2013); rhythm guitar (2001–2002)
• Mikey Way – bass guitar (2001–2013)
• Frank Iero – rhythm guitar, backing vocals (2002–2013)
• James Dewees – keyboards, backing vocals, percussion (2012–2013; touring 2007–2012)

Former members

• Matt Pelissier – drums, percussion (2001–2004)
• Bob Bryar – drums, percussion (2004–2010)