Sounds fun! I'll try:
1. Elisabeth Hope
-- Rebellious and free-spirited, but raised on good morals that stick strong. Has curly, shoulder-length hair, or maybe she despises curly hair all together and shuns female ditzes?
2. Jason Hope
--Similarly rebellious, but life experiences block him from seeing everything the same as Elisabeth. Also, Elisabeth's older brother? Short, dark brown hair and a large nose?
3. Alice Hope
--Elisabeth's more "Feminine," older sister -- about the same age as Jason? And Elisabeth might disagree with her on most things, while Jason accepts her (Alice) warmly. Blond(e)!
4. Melody Rosabelle
--Extremely energetic and outgoing. Very talkative. Melody's always the listener when she has to be, and she can be the shoulder to cry on, but for the most part she's a high-energy gossiping type.
5. Matthew Haven
--Mathew remains fairly mysterious, I picture. He seems to have some extreme goals of some sort, and he's one of the most important characters to the plot?
6. Jake Solstice
--Another important character to the plot, just guessing by the name, but his appearance is made earlier than Mathew's. Jake seems like someone who would be Elisabeth's friend, and Jason may not like him very much. That's assuming I'm right in thinking Elisabeth might be the main character.
7. Victoria Ivy
--The "slut" -- don't mind me saying so if it's completely untrue. I'm going by gut feeling! Then again, she could be the type to be very in-tune with the cycles of life. Also, out of all of them, this one strikes me as the type that would have a sort of special power, or a crucial ability that the main characters basically have to beg out of her. Victoria is also the type to "always be right?"
8. Olivia Winters
--Rude, blunt, straight forward, brash, and inconsiderate. Sandy brown hair -- or, even better, black, and maybe it's short, too. That's the feeling I get for this one. She probably has some sort of connection to Logan and/or Jake, or maybe she's just familiar with Logan's name and has heard of him before.
9. Daniel Omen
--The dreary type. Daniel likes to help people, but ends up coming across as gloomy or negative? Daniel doesn't strike me as the type to have many friends... but seems nice enough.
--Sophia... my best guess would be to place Sophia as someone with a set path she can't stray from. Also, she tends to "walk her path alone." Sophia may have come from a family of several normal people, and she probably has special abilities (powers or skills) that might or might not get her into trouble frequently, even though she uses them to help her get out of trouble. If Sophia's the withheld type, especially because of the path she's on, she might lighten up pretty soon after meeting the main character(s).
11. Nia Edge
--Very cool name, but I can't get a great picture with her (her, right?). Is she a thrill seeker? An adventurer? Maybe she's a business woman, and she leads an enormous company as the head figure. Or, could it be that she works behind the scenes and pulls all of the strings? I get a picture either of her literally on the "edge" of a mountain, or on the brink of a major breakthrough in technology or success (which would relate to the business idea).
12. Logan Snow
--Logan, who I said previously might be related to or known by Olivia, is probably one of the nicest guys in the story. Hmmm? Even with his name dealing with snow, he doesn't seem cold. Or, at least he doesn't seem heartless. Maybe he comes off as a little bit cold at first, but I bet he's sincere. Also, the idea of a gambler or party-type came to mind, or even the one character who's always good for a laugh.
13. Julia Chronicle
--For this one, the only thing that came to mind was "writer."
Hope I did good! If not, I hope my guesses were at least entertaining. :) Cool names, by the way!