There are certain actors who somehow manage to play roles that we never, ever forget. Whether it's the hero, a criminal, or even a crazy person, these actors have a knack for choosing the perfect role for their look and personality and often play several unforgettable roles over the course of their careers.

From playing the psychotic inmate on Prison Break to Monroe in NBC's Grimm, Silas Weir Mitchell is one of those actors who embodies each and every single role he plays.

Every second on the screen is as entertaining as the last and I find myself looking forward to seeing what Monroe will say and do next each week.

I had the pleasure of speaking with the equally entertaining actor about his role on Grimm, what he has to go through to get into his "blutbad" persona and which role has been the most challenging to play...

Q: Did you grow up knowing you wanted to be an actor?

Silas: "I kind of was actually. It was something I always enjoyed. When I was young, the first part I played was in Hansel and Gretel when I was in third grade, and it just dawned on me the irony of that about a week and a half ago. When you're that age and you do something and get a pat on the back, you're likely to continue doing it because it's nice to get approval. I did acting all through school and kept going into bigger and bigger arenas and testing my skills. As you grow, your experience starts to deepen past wanting to get the part."

Q: Through the years you've played several mentally unstable actors -- is that a coincidence or do you pursue these types of roles?

Silas: "I work for the circus really...

Working on a film or TV show is essentially working for the circus. There has to be some guys who swing from a hot air balloon and have cow milk squirted in his face. Seriously though, some of it is typecasting, but I can't blame it all on that and nor would I. On Grimm, Monroe is just a vegan clockmaker trying to stay on the straight and narrow and as does everyone, there are some elements in my psyche that trouble me. We all have these inner archetypal blueprints."

Q: Which role has been your most challenging to date?

Silas: "There's a play I did by David Rabe called Hurlyburly where I played Eddie and the role was very physically and mentally demanding and I performed it in L.A. and it was very challenging."

Q: And which role has been the most fun?

Silas: "This one, Grimm by far. We all enjoy working together. It's a great job, a great city and a great group of people to work with and I feel very, very lucky right now. This type of situation doesn't happen very often."

Q: Tell us about Monroe on Grimm...

Silas: "I'm someone who is a descendant of a dangerous mythological creature who is just trying to maintain a normal human existence in the face of that dark history."

Q: How long is the makeup process when you have to go into the Blutbad form?

Silas: "It's about 6 to 7 hours, but I've only had to do that once. They took imagery of me in a lot of different behaviors and can use that when they need to because it's just too time consuming for me to do that every time I morph."

Q: Six hours? What do you do during that time? Do you read, watch TV?

Silas: "The people who do it are SO talented. These guys put a little music on and they go slowly and deliberately and after an hour, you get up and walk around. I know it sounds like its drastically long, but its really not. You're watching your face transform and when you look in the mirror and don't see any of you anymore, it's a delightful thing. Watching that process take place is super cool."

Q: Blutbads... Hexenbiests... Bauerschwein -- Who comes up with the names for the characters? Are they from some of the Grimm fairytales?

Silas: "I think mostly the writers come up with the names. I have not read the tales in German, so there may be some of those names in the German version."

Q: Can the creatures on Grimm always identify other creatures?

Silas: "I don't think so. The idea is that the morphing only happens when a measure of control has been lost either out of fear or aggression. A creature can make him or herself creature out when they want to, but it's not like every creature walking down the street is going to see every other creature."

Q: Do all the creatures know a Grimm when they see one?

Silas: "I think they have to see the Grimm see them. There are very few Grimms left."

Q: Do you use Twitter to keep in touch with your fans?

Silas: "I don't. I waste enough time on my phone and computer to get involved in that. I leave that to other folks. There are enough tweets out there without me contributing. I don't need to know you bought a new pair of socks and they're really cool."

Q: What advice do you have for aspiring actors?

Silas: "Keep your feet on the ground and reach for the stars. I think that was from Star Search. My advice would be if you're serious, just do it for the love of it. If you can't do it for the love of it, don't do it. If you're doing it for some other reason, like money or fame, it's too much of a pain to do it. It has to be art for art's sake."

Q: What would you like to say to the fans?

Silas: "I'd like to say thank you. Thanks for watching and giving us a shot at a second season because without you, we don't exist."