1. Zabuza Momochi: Zabuza is a highly skilled jonin known as the "Demon of the Mist." He specializes in water jutsu and assassination techniques. His unique Silent Killing Jutsu allows him to strike down enemies swiftly and silently.

2. Obito Uchiha: Obito possesses special abilities through his Sharingan, enabling him to teleport and absorb enemies into a separate dimension. He can make them seem to vanish into thin air, making assassination simple for him.

3. Itachi Uchiha: Itachi is one of the strongest shinobi and highly skilled in assassination. During the Uchiha Clan Massacre, he silently assassinated every member of the clan, even highly skilled shinobi.

4. Orochimaru: Orochimaru assassinated several ninjas in Konoha for his forbidden experiments. His skills are likely enhanced due to his "snake" attributes, known for their hunting and assassination abilities.

5. Sasori of the Red Sand: Sasori assassinated the Third Kazekage, turning him into a puppet weapon. His elusive and secretive assassination techniques demonstrate his high level of skill. Overall, these elite assassins in Naruto showcase their exceptional skills in the art of assassination.