Rex Goodwin, sometimes romanized as Rex Godwin, was a major character in Yu-Gi-Oh! 5D's. Goodwin was a former developer from R.R.D., head of Sector Security, and the man from the Daedalus Bridge legend. He is the only Dark Signer to not wear a cloak and the only Dark Signer to not have his dark mark on his right arm (instead, he had it on his back). He bears the dark mark of the Condor and his Earthbound Immortal is Wiraqocha Rasca.
Just before Roman became a Dark Signer, he entrusted Rex with the mission to gather the Signers together to someday stop him and save the world. For the next 17 years, he would go to great lengths to accomplish this.
But after many failed attempts trying to help, Goodwin lost faith in "people sharing bonds" (as stated in 'Signs of Doom Part 3'), developing the idea of turning into a Dark Signer with the powers of a Signer (by using Roman's birthmark). Believing only in the power of his two marks, he'd stop the cycle of conflicts every 5,000 years (however, in Z-one's time-line he was not a Dark Signer).