They are easily annoyed and very sarcastic, especially when dealing with people lacking a normal Intelligence. Unless the visitor has proper authorization, they will not be granted permission to enter Navarro under any circumstances.
The Chosen One will primarily deal with the male gate guard.
If the Chosen One is escorted off the base, they have to talk their way through the gate guard to get back on base. If he cannot be convinced about being a soldier in the Enclave, the base will go on alert and Navarro turns hostile.
He does not allow entry into the base with companions along.
If the Chosen One sneaked into the base and walks near him from inside, he will turn hostile, even when wearing advanced power armor.