Soundwave's cassettes are horcruxes - every time he kills an Autobot he puts part of his spark in another cassette. In his Universe profile, Metroplex/Scamper/Six-Gun was another trio like Prime/Roller/Combat Deck in that "Each has a mind of his own, although each essentially has a personality nearly identical to Metroplex and is mind-linked to him and each other. Scamper tends to be more impulsive and gregarious, Six-Gun more belligerent. The three minds together can be considered units of a single, larger mind, although Metroplex's mind is clearly dominant." Poor Slammer is just a remote-controlled tank, though.