Nick (David Giuntoli) must watch out for the deadly combination of Renard (Sasha Roiz) and Diana (Hannah R. Loyd) in the upcoming season of "Grimm."

During the last installment's finale, the kid demonstrated her awesome power by killing Bonaparte (Shaun Toub), the man who hurt Adalind (Claire Coffee). As far as Diana was concerned, no one has the right to upset her mother. Nick will also be her target, as he becomes a big threat to the reunion of her parents. Diana wants her family to be whole again and if she has to take down the Grimm, so be it.

Giuntoli told TV Insider that the new season is veering away from the Black Claw-Hadrian's Wall war and focusing on the core characters. The one to watch out for is Renard, the new big bad, as he rises to power. Him being Nick's primary antagonist also means dealing with his daughter. If Renard succeeds in brainwashing Diana about Nick, she will be a huge threat. At her young age, she already has a good grasp of what she can do.

"There's a pattern of behavior with Renard that's well established by now. Renard is in love with himself and with power, so when he slays Bonaparte Nick isn't going to give him the benefit of the doubt. He's probably thinking 'Am I next?' Or maybe, 'Is Renard trying to use me for something here?' But in a way what happened isn't so surprising. If Renard is so incredibly power hungry, why wouldn't he stab the head of Black Claw in the back?" the actor shared in the TV Insider interview.

Meanwhile, Roiz has apparently been urging his executive producers to make him a bad person in the series again. Yibada cites a conversation he had with fans during JIBLand held in Rome. He said he liked playing a character that keeps the viewers guessing about what will come next. Renard likes to stay in the gray area, where nobody can tell where his allegiance lies.

"Grimm" season 6 returns this fall on NBC.