Revolver Ocelot

Revolver Ocelot was an assassin under the employ of Assassins Sans Frontieres, who was sent by Vance Vangelis to assassinate Sefer Yetzirah. For some reason, Vangelis specified that Ocelot had to carry a sign with "I am here for the express purpose of assassinating Sefer Yetzirah" written across it. This wasn't enough to raise the suspicion of Lucy Farr, who let him onto Sefer's ship, the Kusanagi, anyway.

Though it's clear by Sefer's continued existence that he wasn't successful in his mission, it's currently unknown what Revolver Ocelot's exact status actually is.

Trivia

 * He's pretty good!
 * He tends to twist his elbow a little to absorb the recoil. That's more of a revolver technique.