Age: 21

"Twilight" Suzuka (黄昏の鈴鹿, Tasogare no Suzuka?) is a female Ultra Class A assassin who only kills when the sun is setting. Her preferred weapon of choice is a bokken, or wooden sword, which through secret, semi-mystical swordplay can be used to slice metal like a cleaver and smash concrete, yet on the next stroke will land only a knockout blow on her opponent. She first appears when she tries to kill Gene Starwind's friend Fred Luo as part of her contract with a rival weapons seller. Gene is able to outsmart her and force her to consent to come after him before she kills Fred as part of her pride. However, in her next appearance, Suzuka saves Melfina from a Kei Pirate and decides to help the group against the Kei Pirates, mainly to go after a member of the Anten Seven named Hitoriga, who killed her family. Surprisingly, Suzuka seems to know more about the Kei Pirates than the rest of the crew. Among the various members on Gene’s ship, Suzuka could best be considered the lone wolf, relying very little on outside help to accomplish her goals and frequently disappearing at ports to take care of "business." She is quiet and pensive, and once tells Gene that she 'sticks around' only because she finds him interesting, much to his chagrin.

Much about Suzuka's past is unknown, such as why the Kei pirates would target her family, how she survived, and who trained her or if she trained herself. Even her age is never really mentioned during the run of the series. All that is known is that her pursuit of the Kei Pirates is of personal nature, particularly towards the assassin Hitoraga, who murdered her clan and family. Near the ending of the series, it is implied that she has feelings for Gene. During her fight with Hitoriga, he asked her "Why are you following this man? Don't tell me you love him." She responded by telling him that he would hear the answer if he defeated her, which ended with Suzuka being the winner. So the nature of her feelings for him have been left unresolved.