Roka was a male member of the Purists in the mid-2370s.

In the year 2376, he informed the Purists' leader, Verad Kalon, that the Odan symbiont had survived the crash-landing of its transport, the SS Tynan, on Galvan III, had been brought to Trill aboard the USS Enterprise-E and was about to be brought to the Caves of Mak'ala via shuttlecraft. He also inquired if he should have the shuttle destroyed, but Verad told him not to, believing that such an act would tip his hand to his enemies too soon. Verad then killed Roka simply for having been the one to have delivered the bad news of Odan's survival. (ST - Divided We Fall comic: "No Quarter")