Valente

&nbsp Agent Valente was an FBI agent who was called to investigate the mysterious disturbances caused by Sam and Dean in Season Seven episode Slash Fiction. So far he has only appeared in this episode. He pretends to be a good-natured FBI agent but in reality is a monstrous Leviathan who appears to have no trouble containing his hunger.

Background
Like all the other Leviathans, he was inside Castiel's body when his mere presence caused Castiel to slowly melt and disintegrate. Castiel walked into a resevoir and then the Leviathan which possessed Valente swam out into the sewers and possibly possessed Agent Valente during one of his former missions.

Hunting the Winchesters
In Slash Fiction, the Leviathans construct replicas of Sam and Dean who are themselves Leviathans. The Leviathan Sam and Dean head to a diner and after debating on the importance of the real Winchesters, they ask a kid to activate his camera, and press record, then they shoot everyone in the diner in a bloody massacre, capturing the slaughter on film. Then they kill the boy with the camera and announce to the world on film that the Winchesters are still powerful and are a force to be reckoned with.

Soon afterwards, the FBI arrive at the diner where the massacre occurred and FBI Agent Valente arrives and views the footage of the massacre in the diner. He seems horrified and disgusted by the brutality the Winchesters displayed, and he seems offended at the ruthlessless the brothers showed when slaughtering the boy with the camera. He is later seen with his fellow FBI colleague, where he says that if they do not capture the Winchesters it would mean less paperwork. He then goes off to hunt for the Winchesters.

Succumbing to hunger
Later, the Leviathan Winchesters are decapitated and their corpses are left and bought to the coroner's office. The coroner, also the sheriff's daughter, is examining the Leviathan corpses and finds a mysterious liquid that she says is not blood. She asks her father why he lied to the FBI. Agent Valente returns and says that she is right, it isn't blood, and reveals himself as a Leviathan. He then eats the sheriff and his daughter. Then he phones his boss and tells him that some of his brothers have been killed. His boss is angry at the fact that the Leviathans are drawing human attention and says he will kill Valente and other Leviathans if they continue behaving like this.