Alerio

 is an informant for Caesar's Legion. He watches all activity at The Strip and reports the information back to Caesar.

Quests

 * Render Unto Caesar: If Vulpes Inculta is killed before the Courier reaches the Strip, then Alerio will be the one to invite the Courier to meet Caesar himself.

Appearances
appears in Fallout: New Vegas.

Bugs
Well after inviting you to meet with Caesar he may appear, run up to the Courier, and initiate dialogue saying only "What do you want?" while your only option will be to end the conversation. This can even occur inside private hotel suites.