From what I gather, there are over 20 brand new characters introduced in The Twilight Saga: Breaking Dawn, the final book (and film adaptation) in Stephenie Meyer's series. Since Eclipse is already filming and probably not adding too many more cast members, we'll concentrate more on the final book, which, according to Robert Pattinson, will most likely go before cameras next summer.

 
Now, since I'm the farthest from a Twilight expert, I'm not going to take guesses as to which characters they will or will not include in future installments. Instead, I'll just give you five people who I'd personally like to see pop up in some way, shape or form.
 
 
Megan Fox
Yup, I think Megan Fox is on all my lists (deal with it), and it's because I think she's one of the more fascinating actresses working today. Her turn as an evil demonic monster in Jennifer's Body proved that she looks good with a lot of blood around her mouth – a trait that would make her perfect for the Twilight series.
Potential Character: Kachiri -- an Amazonian vampire who is part of the Amazon Coven along with Zafrina and Senna. She is described as tall and muscular with wild dark hair and long limbs.*
 
Robert De Niro
Who wouldn't want to see Robert De Niro as a big, burly wiseguy-esque vampire? I mean, that's if one already exists – if not, I'm sure we can make one up. C'mon, it's De Niro! I could almost picture it now: He strolls in all tough-like with a leather jacket and a dark pair of shades, and goes…"Hey, Edwhatsurname – where can a guy get some decent Italian food in Forks, Washington?"
Potential Character: Liam -- he is described as hard-faced and physically imposing. Liam is not a vegetarian and also does not have any extra gifts.*
 
Beyonce
One thing the Twilight series hasn't done yet is include a big-time actor or actress who could also belt out a tune for the soundtrack (with the exception of that random Pattinson scene in the first film). And considering there's a big Egyptian presence in Breaking Dawn, it might be a good opportunity to grab someone like Beyonce who could add a little pop sensation to the final film of the franchise.
Potential Character: Tia -- an Egyptian vampire. She is described as having an olive tone of skin and midnight-colored hair. She has no extra talents and is a quiet woman. She is very intelligent however, and has great insight to what she says.*
 
Emmy Rossum – This up-and-comer starred in recent films like Dragonball: Evolution, Dare and Poseidon, and is poised to become the next Anne Hathaway or Emily Blunt. Since the Twilight franchise is all about promoting up-and-coming talent, why not throw Rossum a nice, juicy role – perhaps one that includes a little seduction.
Potential Character: Lizzie -- she is described with light red-gold hair, fair skin, a few gold-colored freckles that are sprinkled across her cheeks and nose, and eyes that have the color of cinnamon.
 
Scarlett Johansson, Amanda Seyfried and Kristen Bell
Okay, I strayed a little from my set of five, but only because I do know that the gorgeous Denhali sisters play a major role in Breaking Dawn, and all three roles would be perfect for three beautiful blonde-headed actresses like, um, the three ladies I listed above.
Potential Character(s): Irina (described as being a vampire with chin length silvery blonde hair and golden eyes), Tanya (described as having curly strawberry blonde hair) and Kate (described as having golden eyes because she lives on a diet of animal blood as opposed to human blood. She also has hair that is "long, pale blonde, straight as corn silk")*
 
So what do you think of my choices? Will any of these characters actually show up in the movie or am I completely off base with my predictions?
 
*The character descriptions come from the Twilight wiki.