MiB Guard

The MiB Guard is an MiB member and is portrayed by Alpheus Merchant. He is almost always seen sitting and guarding the front elevator of MiB Headquarters. He can be seen reading the newspaper and speaking when Agent J or K walks by. In Men in Black 3, he is briefly replaced by a different guard in the altered timeline. He is replaced in Men in Black: International.

Trivia

 * In Men in Black 3 Jay calls him "Pops". Pops could be his real name or it was probably just a nickname given to him.
 * The Guard did not seem to do anything when Serleena had taken over MiB Headquarters in Men in Black II, though it was implied that he was unable to do anything to stop her due to the lockdown.
 * The man who plays the guard, Alpheus Merchant is not a very famous actor. In fact, people may only recognize him of this role.
 * In Men in Black II, on one of the pages of the newspaper he's reading says, "Satan Escapes from Hell", and funnily enough he says Serleena is causing all kinds of Hell. The newspaper could be implying Serleena as Satan.
 * It also acts as a subtle reference to the MIB's jobs in the original comics, where, besides aliens, they also investigated supernatural phenomenon including demons.
 * He's the only character to appear in all three films besides J, K and the Worms.

Appearances
Men in Black I

Men in Black II

Men in Black 3