Kelly Wong appears as a female vampire with black hair and black eyes, often depicted wearing a jacket and turtleneck. She serves as the leader of a group of refugee vampires seeking entry into the Special Zone, a designated area in Japan meant to serve as a sanctuary for their kind. Her group is introduced arriving by ship, attempting to enter the zone illegally, which brings them into immediate conflict with the Special Zone Suppression Team, an organization dedicated to controlling and eliminating vampire threats.

Personality-wise, Kelly is portrayed as a pragmatic and protective leader who is fiercely dedicated to the safety of the refugees under her care. She openly confronts the Suppression Team, accusing them of being homicidal maniacs rather than lawful enforcers. This confrontation demonstrates her willingness to stand up against authority figures to defend her people. Her motivation throughout the story is driven by a desire to find a safe haven for herself and her fellow refugees, who are marginalized and hunted. One member of her group is a young vampire girl named Chan, whom Kelly transformed from a human child suffering from a terminal illness at the request of the child's parents. After this transformation, Chan remained by Kelly's side and came to view her as an older sister figure. This relationship highlights Kelly's capacity for compassion and her role as a maternal figure to the vulnerable members of her community.

Kelly's role in the story is primarily that of a supporting character whose actions drive the plot concerning the refugee crisis and the threat of the Kowloon Children. After a battle on the ship causes an explosion, Kelly and the other refugees escape by small boat, while the main protagonist, Jiro Mochizuki, is separated from his brother. Later, Kelly is found again with another refugee named Johan Tsang, and she asks for Jiro's aid against the Suppression Team, who are targeting her group. During this encounter, she is shot in the arm. She later explains to the negotiator Mimiko Katsuragi that she would have allowed Jiro to drink her blood to help him escape the Suppression Team, revealing a pragmatic willingness to sacrifice her own well-being for strategic advantage. This conversation also touches on the nature of Kowloon Children, with Kelly arguing that they are viewed as monsters just like all other vampires, showing her cynical understanding of how her kind is perceived by the outside world.

A significant turning point involves Johan, who is secretly a Kowloon Child, a special and dangerous type of vampire capable of turning other beings simply by drinking their blood. Johan infects the other refugees, including Chan, transforming them into Kowloon Children against their will. Chan is subsequently kidnapped by Johan, and her tragic story concludes when she is killed by a member of the Suppression Team. This event serves as a major development for Kelly, as she loses members of her group, including a child she had saved and cared for.

Despite the tragedies and losses she endures, Kelly ultimately achieves her primary goal. By the end of the series, she is the only member of her refugee group to successfully enter the Special Zone. This outcome suggests a measure of resilience and the culmination of her efforts to secure safety, even if it comes at a great personal cost and without the people she originally sought to protect. Information regarding any specific supernatural abilities beyond those typical of vampires in the setting, such as enhanced physical capabilities, is not detailed in the available sources.