Rimsen, originating from Agamar, served as a male officer within the ranks of the New Republic Defense Fleet. By the year 25 ABY, he had achieved the rank of captain and was in command of the vessel known as the Corusca Fire. When his designated route was changed, diverting him away from Vector Prime, he grew suspicious and rerouted his ship towards his homeworld. Upon reaching Agamar, he discovered from his relatives that Leia Organa Solo had visited, seeking allies for the conflict against the Yuuzhan Vong. Subsequently, Rimsen directed the Corusca Fire to link up with the Ralroost and joined Traest Kre'fey in providing assistance during the Battle of Dantooine.