Akame (Akame Ga Kill!) is a deadly assassin with her skills and equally deadly Muramasa Sword.
Kurome (Akame Ga Kill!) is a deadly assassin, with drugs and experiments inserted into her body and her dead-controlling sword, Yatsufusa.
A seasoned assassin, Chelsea (Akame Ga Kill!) used her "Gaea Foundation" to transform herself, and then swiftly stab her unsuspecting target in a vital spot.
Korosensei (Assassination Classroom) is a master assassin, once known as the God of Death.
As the Commander-in-Chief of the Onmitsukidō, Suì-Fēng (Bleach) is one of the foremost masters in the art of assassination.
Both Urahara Kisuke and Shihōin Yoruichi (Bleach) were formerly in the Onmitsukidō, as Yoruichi was the former commander in cheif, and Urahara her lieutenant, and are masterful assassins.
Sosuke Aizen (Bleach) assassinated all the members of Central 46.
Haruto (Code:Breaker) is a very powerful assassin even before acquiring his powers, having a success rate of 99.9%.
As the world's greatest assassin, Mercenary Tao Tao Pai (Dragon Ball) is such a skilled killer that he can kill people using only his tongue...
...and after becoming a cyborg, Tao has eschewed the honor of a martial artist to truly devote his efforts to kill his targets at all cost.
The members of Trinity Raven (Fairy Tail) are the strongest of the Assassins in the Death's Head Caucus guild.
Jacob Lessio (Fairy Tail) is a genuine master of Magical Assassination, and one of the Spriggan 12 which makes him all the more dangerous.
Nicknamed the Bastard Child of the Death God, Mukuro, later known as Nobume Imai (Gintama) was trained by Tenshoin Naraku as an assassin from childhood, and her skills were so deadly that she was named as one of the Three Wings of Naraku.
As the leader of the Tenshoin Naraku, Oboro (Gintama) was considered to be the strongest assassin within the group, with his mastery of Hakkei and acupuncture needles to back up his reputation.
The Zoldyck Family (Hunter X Hunter) are the top assassin group in the known world.
Killua Zolodyck (Hunter X Hunter) can use techniques to assassinate.
Kisame Hoshigaki (Naruto) was an assassin of the Kirigakure, and would kill even his own comrades to protect what he deems important.
An assassin for the Root organization, Sai (Naruto) is said to be the strongest of his generation, going as far as to eliminate his emotions.
In her own words, Nico Robin (One Piece) is skilled in assassination...
...using her mastery over her Hana Hana no Mi powers to restrain her target's movements.
The strongest of his generation, Rob Lucci (One Piece) was the greatest assassin in the history of CP9 and has served as the World Government's greatest killing machine since the tender age of 13.
The third strongest assassin of CP9, Jabra's (One Piece) skills as a Six Powers/Rokushiki master along with his Iron Body/Tekkai Kenpo makes him one of the deadliest assassins for the World Goverment.
Shuzen Akua (Rosario + Vampire) is the assassin of the Fairy Tales, and formerly of the Miao Family.
Golden Darkness (To Love-Ru) is a legendary intergalactic assassin.
Due to his fame, Younger Toguro (Yu Yu Hakusho) has been hired by many as an assassin.
Elder Toguro (Yu Yu Hakusho) is hired by many as an assassin due to his fame.
A descendant of legendary assassins known as the Shiyuu
, a clan infamous for their bizarre and unique forms of swordsmanship
, Kyou Kai (Kingdom) is reputed to be the strongest of her generation...
...easily dispatching skilled Zhao scouts with her Dancing Step
As his lord, Ren Pa's Flying Spear, Rin Ko (Kingdom) demonstrates his skills as an assassin...
...dispatching strategically important and valuable 1000-man commanders.
Since his days of fighting the Xiongnu on the border of Ganmon, Ri Boku of Zhao's Three Great Heavens (Kingdom) waits for the right moment when his opponents are vulnerable to completely surprise them with deadly assassination.
Out of all the Trinity Seven, Levi Kazama (Trinity Seven) has killed most during her assassination missions, and achieved perfect success rate in both missions and assassinations.
Sham Lash (Magi The Labyrinth of Magic) the Parthevian Empire secret assassination squad.
As the leader of the Sham Lash, Shaka (Magi The Labyrinth of Magic) is dangerous master assassin, able to massacre countless people by himself...
...and kill a Household Vessel Assimilated Giant Monster with a single ki-infused attack.
Jafar (Magi The Labyrinth of Magic) is a child prodigy in assassination, having once been one of Sham Lash's most elite assassins at 10 years old.
Goblin Slayer (Goblin Slayer) uses various assassination tactics...
A top-notch sniper of the highest caliber, Duke Togo (Golgo 13) is the world's greatest hitman and assassin.