ZZ Top guitarist Billy Gibbons plays a fictionalized version of himself, as the father of Angela Montenegro. Angela's middle name is "Pearly Gates", the same as Gibbons's Les Paul guitar.
Gibbons's character is extremely protective of his daughter, almost to the point of sociopathic. Several times he has threatened Angela's now husband, Jack Hodgins, that if he hurts Angela in any way, he will pay. After Hodgins and Angela broke up, Gibbons blamed Hodgins and began "haunting" him by following him around and generally unnerving him. Angela tried to talk to him, and despite promising Angela that he would leave Hodgins alone, he drugged Hodgins, tattooed Angela's face onto his arm, and left him unconscious in the middle of the desert. On another occasion, he wanted to name Hodgins and Angela's child, Staccato Mamba, but Hodgins rejected the name and insisted that they would either name the child Michael Joseph if it was a boy, or Katherine Temperance if it was a girl. He retaliated by again, drugging Hodgins and tattooing his own face onto his other arm, and dragging him into an alley. Actions such as these have made many characters afraid of him. Even Angela, who loves him and is not afraid of him, is afraid of what he can do. The moment Angela saw her father after she and Hodgins split, she immediately told Hodgins to leave town, knowing her father intended on punishing him, and fully aware of the damage he could cause. Despite this, Angela shows no fear of him for herself. When she found out what he had done to Hodgins she claimed she was "so going to kick his Texan bad ass." According to Sweets, he keeps a black cat's bone in his pocket, a fact which Sweets finds extremely unnerving.