David Ratchet

Dave, referred to as "Big Sir", is an inmate at Iron Heights Prison.

Biography
Dave shared a close relationship with Henry Allen, who helped summon the warden to perform surgery on Dave who had suffered from appendicitis.

Iron Heights
As an inmate who had previously had an altercation with Barry attempts to stab him with a shiv, Dave rushes in to save Barry and fight off the inmates, the leader of the gang assures him it is not over. Dave then told Barry he saved him as a favor to Henry for saving his life after being overcome with appendicitis. Dave is ambushed by the gang for interfering earlier but Barry uses his speed to overpower the gang and save Dave's life.