Flonne  

An angel who has been trained to kill and believes in love is sent to the Netherworld with the mission of assassinating King Krichevskoy. However, upon arriving, she discovers that he has already passed away. She then decides to follow Laharl, a man who does not believe in love, in order to find good within him. Despite her naivety and tendency to dwell on one topic for an extended period of time, she is willing to take down anyone necessary for the mission.