Diego

 is the acolyte to Father Clifford at Saint Monica's Church in Rivet City. There are rumors of his involvement with a girl in Rivet City (the daughter of the cook) Angela Staley. The dweller can either force him to relinquish the church or the girl (by saying you will tell the father, or telling the father directly). If you convince him to choose the girl they will end up getting married and you have the option to attend the ceremony.

Bugs

 * In the PS3 version, there may be no lyrics during the wedding ceremony. People just sit around in the chapel whistling while the couple stands next to the father, silently. This bug does not appear to affect the PC or 360 versions.
 * This editor reports encountering the same bug in the PC version. Will test later.
 * Diego spends late nights wandering Rivet City's flight deck, and has an unfortunate tendency to wander off the northern end of the flight deck and kill himself on the walkway below. Even though Diego may die, this won't prevent the wedding -- Angela will happily stand at the altar and say her vows alone.

Apperances
 only appears in Fallout 3.