Lieutenant Commander Rodianos was a Starfleet security officer who served aboard the USS Republic in the early 2250s.
In 2251, Rodianos accompanied Captain Rollin Bannock to the Republic's transporter room to welcome Cadet-Lieutenant James T. Kirk and a group of cadets aboard for a training mission. For the duration of the training mission, Rodianos was placed in charge of the cadets, and they had to report to him.
A few days later, when the Republic was participating in a top-secret mission inside the Klingon Neutral Zone, Commander Ellen Mangione ordered all of the cadets to remain in their cabins. However, Rodianos and Hogan Brown caught James Kirk and Gary Mitchell wandering the corridors. As they had broken orders, Rodianos marched them up to see Captain Bannock. (TOS - My Brother's Keeper novel: Republic)