Well... let see...
☆ Charlie is probably new, correct me if I am wrong.
☆ Derrick is from "A Class By HImself".
☆ Ariel is from "Kiss Of An Angel".
☆ Tyler... he also originates from "Kiss of an Angel" as Ariel's object of affection.
☆ Zack... it took me a while to remember the title, but he originates from "My Only Escape".
☆ Evan, no doubt, is from "Waiting Outside The Lines". I had to admit I would not have remembered his name if you never included the tidbit about Evan's collection of Greyson's works.
☆ Justin is from your infamous "Gone From Daylight" series.
☆ "Savage Moon" is self-explanatory. (I have not read this story yet... 🙁)
☆ Drew is from "On The Outside". This story I have not read to the end yet but will be planning on doing so soon.
☆ Jamie is from "Some Time Alone" but I could be wrong there.
☆ Billy is from "The Secret Life of Billy Chase" series. (I have not read it yet, though. I will soon.)
☆ The dynamic duo (besides the other three pair in the same story), Randy and Ryan, are from "New Kid In School".
☆ Jesse-101... hmm... sounds familiar. OH!! He's from "Jesse-101: Online Celebrity"!
☆ Dustin is from "Untouchable" but I have not read this story either so I could be wrong.
☆ Adam... I think he originates from "Lessons in Love".
☆ Shane and Dimitry is from "Left Without Words", a story I also have yet to read.
☆ Russ is from "My One True Weakness".
☆ Carter and Kevin is from "Boy #6", judging by the piece of text that stated something about the school's newspaper.
☆ Ethan is from "A Step Brother I Could Love".
☆ Rory is definitely from "Picture Me And You". I absolutely adore that story along with all of the other stories listed here. (Except for the ones I have not read yet. It is difficult to say a story is a favorite or not without reading it first after all.)
☆ I assume Cory and Ben is from "Save Or Sacrifice" but I have not read that story either so I do not know for certain.
☆ Donnie is from "Dream Lover". It looks like Caleb had harassed Donnie the night before.
Stevie and Simon I could not pinpoint whatsoever...