Koemi Kikawasa
 

Koemi was named after her mother who was the best ghoul police agent in her time.  Koemi's father was posessed by an evil spirit and became the evil Dark Lord Meijing.  Koemi's mother took Koemi to The ghoul Hunters Secret Headquarters to protect her from the evil creature her father had become.  Dr. Gonjen greatfully took Koemi in and trained her.  She is now the best Ghoul Hunter in the business.
Koemi knows nothing of her past, except she's been at GH1 since she can remember.  She considers Gonjen her father, and he has said nothing to contradict her belief.
When Koemi was 15, she was on a mission to distroy a vampire colony.  She came back to Headquarters completely changed into a vampire and found Kananno to be the only one there.  She tried to seduce him in order to change him and quench her thirst.  Kananno realized that she was not herself and fought her off until he could inject her with the antidote.  Koemi claims not to remember anything about that day, but every now and then she will "slip up" and say something about that day.
Kananno was assigned to be her partner after gonjen found out.  He claimed that she was in serious danger working alone.  Koemi said that she was in no more danger than the other agents, but Gonjen's opinioned remained unchanged.  She is still partnered with Kananno today, after 2 years.