The power to possess the skills to locate and slay targets like an assassin.
User can perform the art of assassination better than the average killer, they are able to dispatch their victims without as so much as a struggle. The ways to do this range from something complex and high-finesse like mastery in stealth, strategically planned scenarios and highly disciplined martial arts to something simple-yet-effective like brute strength and raw speed to overwhelm the targets.
Korosensei (Assassination Classroom) is a master assassin, once known as the God of Death.
As the Commander-in-Chief of the Onmitsukidō, Suì-Fēng is one of the foremost masters in the art of assassination.
Both Urahara Kisuke and Shihōin Yoruichi were formerly in the Onmitsukidō, and are masterful assassins.
Nico Robin claimed to be an assassin before joining the Straw Hats.
Rob Lucci is the strongest of the CP9, World Government's secret assassin squad, even at the tender age of 13.
Jabra is the third strongest assassin of CP9, though he messed up that he was required to kill more than he originally had to.
Shuzen Akua is the assassin of the Fairy Tales, and formerly of the Miao Family.
Akame is a deadly assassin with her skills and equally deadly Muramasa sword.
Kurome is a deadly assassin, with drugs and experiments inserted into her body and her dead-controlling sword, Yatsufusa.
Golden Darkness (To Love-Ru) is a legendary intergalactic assassin.
Nobume Imai (Gintama) is a master swordswoman and the commander of the Mimawarigumi's assassination unit.
Mukuro, later Nobume Imai (Gintama) has been trained by Tenshoin Naraku to be an assassin even as a child, and her skills is such that she is one of the Three Wings of Naraku, and often called the "Bastard Child of the Death God".
Oboro (Gintama) the leader of the Tenshoin Naraku, considered to be the strongest assassin within group, with his mastery of Hakkei and acupuncture needles to back up his reputation.
Younger Toguro has been hired by many as an assassin due to his fame.