Lena is one of the Temple Guards serving in the Holy Kingdom of Harmonia and as the deputy leader of that organisation's second squad reported directly to Sasarai. She is related to the House of Latkje and heir to the House of Suphina and growing up, she was a childhood friend to both Julie and Nash. She was also Nash's superior in the Temple Guards when he was a part of that organisation.
When Nash apparently killed Zaj and fled the country, it was Lena who helped Julie through this troubled time. Although she supported Nash and believed he had good reason behind the seemingly unprovoked attack, she was also angry at him for abandoning his sister. Still, she is one of the few people that truly understands Nash.
She would later help Nash escape from prison in Caleria by slipping him a hair pin, which he used to unlock his restraints. In addition, when Nash finally returned to Crystal Valley, Lena petitioned Sasarai to prevent Nash's arrest so that he could confront Zaj. Following Zaj's defeat, Lena tried to persuade Nash to return home to his sister but, briefly distracted, she is unable to prevent Nash from leaving once again.