Gustavo is the head guard at Tenpenny Tower.
Getting in Tenpenny Tower and speaking to him will result in the start of Tenpenny Tower Quest. Gustavo tells you a group of ghouls wants to live in Tenpenny Tower, but he is not allowed to let them in. He says he cannot hunt them down, because the residents of the tower need to be protected.
To finish the quest, you can do a number of things:
- Side with the ghouls, and open the basement door for the ferals to slaughter the residents. Or you can kill them yourself. You'll get the Ghoul Mask.
- Convince all the residents of Tenpenny Tower to let the ghouls move in, you'll also get the ghoul mask.
- Kill Roy Phillips and his followers and get 500 caps from Gustavo.