‘What We Do in the Shadows’ stars tease Nandor and Guillermo’s ‘surprising’ new relationship this season

• Kayvan Novak and Harvey Guillén opened up about their characters' changing relationship.
• The actors, who star on FX's "What We Do in the Shadows," said changes were in order this season.
• "It was a nice surprise," Guillén said of Nandor and Guillermo's newly developed friendship.
• Visit Insider's homepage for more stories.

Kayvan Novak and Harvey Guillén opened up about their characters' changing relationship on the new season of "What We Do in the Shadows."

"I didn't expect it," Guillén told Insider of the new dynamic between his character, the human familiar Guillermo, and Novak's vampire character, Nandor.

Guillén said that most of the time, the cast doesn't get their scripts until closer to filming – meaning that he was caught off guard by the new direction of Guillermo and Nandor's interactions.

"It was a nice surprise. It was nice to see that Nandor is showing that he does care for this person that's devoted 11 years of his life to being his familiar," Guillén said.

"I knew that at the end of the season two, something was going to change forever between Nandor and Guillermo," Novak shared. "You know, the fact that he's no longer just a lowly familiar and he actually has some real power."

"I think that's difficult for Nandor to accept," he added.

According to Novak, finding out that Guillermo was actually a skilled vampire slayer at the end of season two was "quite a challenge" for Nandor, and that at the start of season three, his character wanted to "run away" from the responsibility of maintaining a relationship with his powerful familiar.

"But then what's sweet is that he does come back and he does express that he cares for Guillermo - begrudgingly, because he's not good at expressing his emotions," Novak told Insider."But that's Nandor for you."

Season two of "What We Do in the Shadows" ended on a bit of a cliffhanger, as the vampires were left to determine Guillermo's fate after he saved them from being killed by the Vampiric Council.

And season three sees the housemates deal with the repercussions of having a slayer in their midst, in their usual hilarious and absurd fashion.

The new season of "What We Do in the Shadows" is currently airing weekly on Thursdays on FX, with new episodes hitting Hulu the next day. You can watch the trailer below.