Lunark (Kor. 루나크) is a werewolf warrior and had served as the 5th Elder of the Union until after she withdrew from the Union along with the rest of the werewolf clan. She was the only female Union Elder.
Lunark is typically a very cynical person. She's shown to truly enjoy the thrill of battle if her opponent is strong enough and expresses deep anger at anybody trying to interrupt her.
Her sense of honor and pride is sometimes in conflict with her goal-driven actions.
However, despite her personality, Lunark had shown a compassionate side. Although she is aware that Muzaka is deemed by their tribe as a traitor, she felt sadness by this revelation. Unlike the majority of the werewolves, she and her friend, Kentas, rejected any modification to their bodies and just rely on their natural power and strength.
She and Kentas believe that the role of a Warrior is to protect their race and not to sacrifice them for the sake of power. In order to protect Kentas and to stop the atrocities carried out by their clan, she didn't hesitate to seek out Muzaka.
Her history with the Union is not entirely disclosed yet, but her rank suggests that she is a senior and powerful member of the Union, as well as of the werewolf race. She appears to have lived for quite a long period of time as well, due to her knowledge of Frankenstein from over 800 years before the series started. She is first introduced in the series when she is sent along with 7th and 8th Elders to punish the ones responsible for Rostere and Muar's deaths as well as start the war against Lukedonia by attacking their hierarchy.