I'll start working on a sheet - kinda late so will likely go up as a WIP:

[hider=Jennifer (WIP)]Name: Jennifer "Jenny" Sanders
Age: 17
Gender: Cis female

Appearance: [url=http://thumbs.dreamstime.com/z/black-teen-standing-railroad-bed-6526759.jpg]For now using stock image, sorry[/url]

Personality: The first thing most people would use to describe Jenny is 'energetic' - she rarely seems to be tired, even minutes before falling asleep. No task that exceeds her physical capacities is impossible to her, and she does not seemed daunted by any amount of work before her. Unless, of course, the work is impossible to her in which case she won't even bother. In a sense, it can thus be argued she's rather cowardly in that she won't try things she believes she can't do, instead of seeing if it truly is impossible. It can also thus be argued she has common sense, as what good is it to waste energy on something that can't be done, just for the sake of trying it? Both views have been held by people she knows. 
Beyond that, it's generally agreed upon that's she's talkative, usually one to approach than to be approached, and seems to enjoy physical activities over academic and artistic ones. She has a weakness for small animals, though large dogs visibly unnerve her. In classes, she tends to record lectures when possible and simply listen to them later while jogging. She doesn't typically plan out things and, in a tight situation, goes with her gut over any analysis.

Your History: Jenny grew up in Sparks, Nevada, as an only child surrounded by many older relatives in the area. She did fairly well in school and took gymnastic classes in her free time, as few things in general attracted her attention. She made friends easily, to be sure, though once they went their separate ways, she also had a hard time keeping in contact with them. So it goes. It was just a thing that slipped her mind. Her mother was concerned about the lack of interest and had her talk to a counselor a few times, though they reported no issues. Overall, her life was fairly quiet - some classmates needed to learn to keep their hands to themselves, some adults needed to keep their words to themselves, but Jenny never felt particularly threatened. The most exciting thing, as far as she was concerned, were the family reunions when her father's family flew in from the eastern coast and when she and her parents went to visit her mother's family in Tecate. 
During her first month of high school, she noticed one of her classmates, Randolph, struggling excessively during classes - he seemed to never have an answer ready and was frequently kept after class by the teachers. The whole scenario just seemed so strange that she ended up talking to him during lunch to discover he had been homeschooled and, well, despite his looks, he hadn't finished the material needed to even be in high school. Jenny promised to help him, and the two ended up hitting it off pretty well. His name was Randolph, and the more she learned about him, the stranger he seemed. Regardless, the two were good friends for almost three years and she managed to even get him coasting by in school with low Cs. Then, he stopped attending. Jenny visited his house, only to find his mother packing for a move and refusing to talk about him. Life moved on for everyone else, and it seemed everyone forgot about the odd boy.
She ended up developing another interest, now in unexplained events, and it was through this contact in the first place that she learned of Catalina Academy and its exchange program.

Why are you here?: Jenny learned about the program via Randolph's mother, who had been contemplating sending him there. Once he was gone, his mother moved away, though Jenny became curious afterwards. What about the school had attracted the woman's attention in the first place? She had heard a few things, namely that it was a bit of a tourist trap so she sought to do her own research. In the end, she was left with more questions than answers, and it seemed the best way to resolve it would be to attend the school herself. This meant uprooting herself from her friends and family, so it was certainly no easy decision; it took almost a year to decide. In the end, she chose to go - the school itself had some very high markings, the stories told probably merited consideration if she had the time if only to see how the natives were doing these tricks, and wasn't it possible Randolph had been sent there after all?
When she discovered the application required that something else be enclosed, she decided to film one of her solo tumbling routines and send the tape in with her application. It must have been as good as she hoped, as she did get in.
Faith: Roman Catholic; religion aside, it can be supposed that the one thing she truly believes in is that things always change, be it for the better or for the worse. She'll pray for the better, of course. She also feels she can rely on her family, provided she remembers to actually talk to them.
Fear(s): Large dogs, sudden loud noises, and bodies of water where she cannot see the bottom. On a more existential level, she fears being forgotten and having left a mark on no one - no one lives forever, after all, and the closest one can achieve to such a fate on Earth is to do something amazing.

Astrological sign: Leo
MBTI: ESFP
Other: She speaks some Spanish - not enough for heavy discussions, though, as her mother seemed to discourage her learning it from her family. At this point, Jenny suspects that her mother's side might be involved in activities of questionable legality and her mother doesn't want her to know. Even if true, she still trusts them.

Prologue post: There was a knock on her door. "Come in." What did Jenny have to hide? As far as she was concerned, nothing. The door slowly swung open, and her mother walked in. There was nothing she could complain about, really - Jenny's room was basically as tidy as ever. Her shelf of audio books were maybe collecting a bit of dust, but she had important things to focus on. Research-y things. Her mother had always pushed her to pursue more interests, and she'd gotten her wish. That said, Jenny wasn't surprised to hear her mother sigh, and she tried to ignore it. Most of the topics she was checking now, sadly, were in text-based format, and it was read or suffer though a computer voice. Reading required a little more of her focus.

"Jennifer, why are you wasting your time on this, of all things?" Well, that was unnecessary. Jennifer closed her laptop, lest her mother see exactly what she was reading, and turned to see her mother looking at the newest addition to her room: a cork board, with printed articles and trimmed selections pinned to its surface. All, of course, about the island of Puerto Libre. "For a boy who moved? You could do better."

"It's not about Randolph, Mom." That didn't seem to lift her mother's mood any and, well, admittedly that wasn't entirely true. Yeah, other factors played into this, the reason she was using up a fair amount of ink and paper, but it couldn't be denied that she would have never bothered looking into it if he was still around. "Their school is internationally known for its excellence, and it's not like it'd be more expensive than anywhere else I'd look." Though if she let her mother read into the articles she was currently reading, those reports of excellence would likely be questioned. "Besides, I'm just looking into it. I never said I was going."

"[i]Es un gran esfuerzo por sólo 'interés'.[/i]" Jennifer was fairly certain her mother had said those words. She understood them. Instead of responding to them, though, she watched her mother take down the board and leave the room with it. If she was lucky, her mother was borrowing it to read the articles closely and perhaps understand that this wasn't one of her typical rash decisions. If not, well, Jenny had moved onto a new topic.

She opened her laptop back up and resumed her reading about the odd fog the western part of Puerto Libre seemed well known for.[/hider]

(There also seems to be a tiny typo in the History of Puerto Libre - specifically, fourth bullet point under European contact)