Akame

Famous quote: "It's because I loved her most that I wanted to kill her as swiftly as possible."

Akame is one of the members of the Assassin's group Night Raid. She is the first member to attack Tatsumi, and comes very close to killing him. She initially appears very serious and cold-hearted, but she is actually caring and worries about the safety of her comrades. She has a younger sister named Kurome, who is a member of the Jaegers, and loyal to the Empire.

Akame is often considered to be one of the stronger members of Night Raid, slaying even the strongest of enemies with minimal effort. Her hellish assassination training allows her combat ability to be on par with those as powerful as General within the military levels of the Empire. Her Teigu, One Cut Killer: Murasame, is a katana known for being coated in an immensely deadly poison that can kill those cut by it within seconds.

Akame's cold-hearted and serious demeanor stems from her hellish training the Empire forced on her and her sister after being sold by their parents. Akame became one of the elite 7 imperial assassins. Having been brain-washed to believe the rebel opposition was responsible for the unrest and misery in the kingdom along with the motivation to rise in the ranks in order to see her sister. Akame infiltrated, uncovered and slayed revolution members including friends who had kept a cover. After being tasked one mission to assassinate former general Najenda, she is convinced by the general to not only spare her, but also to instead join her crusade against the Empire by becoming a member of Night Raid. Her defection from the Empire sparks an intense rivalry between fellow assassin and sibling Kurome, along with a mutual desire to be the one to end the other.

(Source: Akame ga Kill! Wiki)