Movieweb interview with Misha Collins. (Spoilery for undefined upcoming show(s).) From the article - I can't decide if it's spoilery or not so this first bit is spoilered:
Since he says he's been sent from the Lord, would it be safe to assume that the Lord has been keeping tabs on Dean and Sam then, and sent you down to help them along?
Misha Collins Yes, definitely. Yeah, God is definitely keeping tabs on Sam and Dean, which is probably a lot of pressure, if you think about it. You know, if God is watching your every move, you should probably straighten up your act a little bit.
Not spoilery but interesting:
You said that Eric (Kripke) gave you some adjustments to your character, but what kinds of things do you do to get into the character of Castiel?
Misha Collins: Well, one of the things that I've done is I have been reading Revelations. Have you ever read Revalations?
A long time ago.
Misha Collins: Yeah. It's amazing, rich material that is full of stories about angels and angels being sent down to Earth to wipe out a third of the population. I mean, there are angels that come down and wipe out a third of the population and then another angel will come down and wipe out a third of all the animals living in the sea and another angel will come down and wipe out all the vegetation on the land. They are some vengeful individules, in Revelations, the angels. In reading that, I was kind of surprised. There is a lot of destructive capacity in an angel's being. Kripke gave me a couple of things to work with right in that audition and one was that the angels haven't actually come down to Earth for 2000 years. They've been watching from a great distance, but now this is the first time they're really getting up close in 2000 years. When I'm talking to Dean, I'm observing these qualities that are somewhat alien to me. There's a curiosity and an inquisitiveness that Castiel has and also a real peacefulness and a real calm and wisdom and knowledge that goes along with being a very ancient being. If you spend your whole life in heaven, I would think that it makes you pretty peaceful, so that's a lot of what I've drawn on. My younger brother, this is going to sound kind of weird, but there's something quite angellic about him. He has this way of, very calmly, just staring into someone's eyes and it kind of feels like he can get into your soul. It's a little weird and really kind of amazing so I did kind of base my character on my younger brother.
Oh, wow. That's interesting. So, we don't really get a whole lot about Castiel in the first episode. He's an angel and he doesn't doesn't really affect mortals too well, with their eyes if they look at him.
Misha Collins: Right.
I've interviewed Jared (Padalecki) before and both he and Jensen (Ackles) seem like they'd be a riot to work with on this series. How have they both been to work with and how did they embrace you coming into the show?
Misha Collins: They're great to work with. They both have unusually good timing with humor, so there's a lot of sarcasm and witty quips being bantered about on the set, which, I'll tell you, makes working a hell of a lot better. They're not primadonnas... well, if they are primadonnas, they haven't shown me that side yet. They seem like very cool, very fun, very energetic, hard-working guys. They put in long hours on that show, they really do. I've been on shows where the star of the show is like rolling their eyes the whole time and totally frustrated that it's taking a long time and bored out of their minds and spend the whole time on set texting their boyfriend on their Blackberry and just had such a really bad tone for the set. Jared and Jensen, and (director) Kim Manners and the other directors working on the show, they're all really good people to work with, which is unusual and very gratifying and makes it a much better experience than it could be.
And:
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