The piercing screams, finding dead bodies, and then having a connection to Peter after his death. It all screamed Banshee, pun intended.
Here's the thing, I couldn't have been happier when they made an Originals spin-off. I wanted Klaus off of Vampire Diaries for so long now. He had this epic introduction into the show, Season 3 was all about killing him, and the writers found every possible way to keep him alive. It just did nothing for the show. They muddled down his character so he's no longer as awesome as he once was.
All Deaucalion really wants is power, hence why he killed his entire pack, and there's only so far you can go with a plot like that. There's not really much you can do with his character, and what you could do, is what they are already doing with Peter, who is the much better character imo and very sassy!
"If he dies I will not watch Teen Wolf anymore." I don't get this though. You loved the show long before he came in. He isn't the factor that made you love the show and he certainly doesn't make the show, so why jump so far?
I have heard about the spin-off talk! But I heard that if a spin-off was done it would be centered around Kitsunes, hence why they are bringing them in during this second half of the season.