A lot of people want to know what my characters are supposed to look like. I am absolutely shit at drawing, so I can't sketch what I have in my head (and believe me, I have a very definitive image) and will have to settle for pictures of actors. If Chemistry ever becomes a movie or a TV show, I'll be sure to call these kids up :P  None of these pictures were taken by me, I just found them on google, so don't try to sue me. If there are any characters not included who you want to see, let me know.
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Connor Paolo as Travis McCall
Connor Paolo is probably most famous as Erik van der Woodsen on Gossip Girl. He has that nice balance of sweet innocence and intensity. Plus, I'm pretty sure his character is a gay kid who tried to kill himself, so, go him!
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Nolan Gerard Funk as Garen Anderson
He first caught my eye when he starred in Spectacular! on Nickelodeon, because he was a) stunningly attractive, and b) playing a snarky musician. He later guest-starred on Castle, where he played a douchey rich kid who murdered his friends. And if there's one thing a guy needs to do to win my heart, it's kill people. (P.S. He sings!)
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Alex Evans as Ben McCutcheon
This is by far the most accurate picture. I knew of Alex Evans (who I believe is mostly famous for being a hot emo kid) before I wrote Ben into the story, and had him in mind when I wrote the character (I'm speaking only of his looks, because I do not know Alex and have no idea what he's like as a person)
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Jamie Bell as Alex Baker
He's... a little too old for the role, yeah, but shut up. I can pick whoever I want. Jamie's a brilliant actor, and cute as a friggin' button.
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David Henrie as Corey Copicetti
While he is rumored to be a huge douchebag and is not actually Italian, David Henrie has an absolutely bangin' body and is a fairly good actor, from what I've seen. Granted, I've only seen him on Wizards of Waverly Place and those fifteen seconds during Bob Saget's voiceover at the beginning of How I Met Your Mother, but still. Not like Corey's in any very emotionally trying scenes anyway.
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Charlotte Arnold as Faye Taylor
It was surprisingly easy to choose Faye (who I may or may not have mentioned is a redhead). Charlotte's most famous for being on Degrassi right now, and Naturally, Sadie before that. I know it sounds like I just spend my whole day watching Nickelodeon, but I really don't.
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Maeve Quinlan as Evelyn McCall
She may be famous for other things, but I really only know her as the homophobic mom on South of Nowhere. See? It's perfect for her!
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Ron Livingston as Bill Anderson
I know him as Lewis Nixon, the raging alcoholic on Band of Brothers, but he's also from Office Space and Pretty Persuasion, among other things. I think he's good-looking enough that he could be believed as Garen's (Nolan's) father, but old-person-father-guy looking enough that no one would say "Oh man, I wish I could see some scenes of the parents banging."
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Gabrielle Christian as Bree McCall
Known to me mainly as Spencer from South of Nowhere, Gabrielle is wholesome, pretty, and quite convincing as Connor Paolo's sister :P