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THere would be no technical problem in doing a black jaguar (panther) as the only panther is a black leopard, a taur, and technically not yet introduced. But we dont' have a jaguar yet either if that's what you want :3

As far as the family background, almost all American teens go through a rebellious "no one understands me/I hate my parents" Stage, or at least a period of friction where they don't feel that they fit in and that their parents don't understand them. I find it very difficult to swallow that her parents would have turned her out at the age of 13 because of this. Not only is it highly illegal (and would get them into SERIOUS legal issues when she suddenly goes missing) but the drastic change of heart from her being their "princess". AND she's their only child. It is much more likely they would have tried counselling or other forms to work with her than sending her out on her own.

I would suggest having a VERY good reason of her being turned out if you don't just want her to have run away (which would be rather similar to Lauren). Maybe she's from a very religious family and she got pregnant (to miscarry/abort/etc the child) and lost too much respect for her parents to go home.

Other than that, she sounds fine, if a little on the similar side to Lauren. But that might just be becaus of the middleclass girl to runaway thing :3

I can't critique until you have a character to critique ^^;
All you've got there is a name and the serum ^_~

Keep an eye on your spelling in places - just as a note.

The way Feral Labs likely procures their samples is through making donations or grants to researchers who are studying animal species currently. Say someone is in a zoological society that has ties to feral labs, who is studying Canines (like Kiniro's Wild Dog quest character) - Feral Labs promises an X thousand dollar grant in exchange for sending them 40 samples of fur while they're at it. Or makes an under the table offer for stem cels. Or make a big contribution for a zoo for several animal samples.
They're not going to have a single go-for going around the world building a Noah's arc of samples - it's not economical, and it would raise eyebrows more than the other way around.

You have them then have a diary that somehow made it to the states. The only time the serums were used were on Moreau's island. Also, if they were just biologists/zoologists collecting samples, then they wouldn't have participated in the actual genetic research on the island. They likely wouldn't have even been working directly for Feral Labs, but another smaller company that had ties, or given a grant separately.

Additionally, even if they HAD gone to the island, there would have been no contact back to the mainland. Any lab tech that goes there stays there.

Now, if you want to have the parents be geneticists having been recruited by Moreau (and still working for the island), that is a completely different story - although it is VERY likely that he would have been hesitant if they still had a kid in school/dependent on them. And also less likely that Gallen would be taken in as a subject without a very good reason if his parents were working on the lab staff.

it sounds like you need to take the character in one direction or another: It is interesting to play a character who is noticing Feral Labs' disappaearances. BUT, again, there is almost no way to build a case from one city in one country based on call-ins. Most of the subjects came from all over the world - some were declared dead (Vasile), Some DID go missing (Ambrose), and yet others like Amaya were adopted orphans, others like Lauren were taken off the streets and would likely never be missed. Others like Cassidy were there for a long-term employ anyway.
Admittedly, Feral Labs is a BIG company. It has its hands in lots of pies, and I'm sure that there are conspiracy theorists out there who have tried to link it to things as far off as the Kennedy Assassination. So it's not out of whack if Gallen is trying to make logical jumps.

So essentially it sounds as if the death of hte parents, the mysterious disappearance of the sister are you tryign to find a way for Gallen to have a chip on his shoulder as far as Feral Labs goes, in order to start the radio program to spout conspiracy theories against Feral Labs specifically.

But Feral Labs is not in the business of disappearaing people in general. The people they DO disappear - go to the island. So the parents' death doesn't sound like something the company would do.

Here's a suggestion. Have your characters' parents die doing whatever it is they do overseas (not even necessarily collecting genetic material. It's superfulous and an unnecessary tie to Feral Labs. maybe they're archaeologists or something that would require them to travel to extreme locations).
Then, you have your character living with his sister until he turns 18, when he is legally old enough to live on his own - she disappears. Maybe, maybe she was doing genetic work in college and she got a job as a technician on the island - or some other Feral Labs staff. She says she'll write, but she never does. He gets worried and begins to dig on info for Feral Labs, and this leads him to start his show/carry a banner against Feral Labs. Hell, maybe he even, in his obsession, blames them somehow for his parents' death, even if it's entirely unrelated.

I think it would be very NEAT to take that to an edge - having a radio show as a conspiracy theorist, with his major target being Feral Labs. Done through the avenue of the "missing" like you say - in trying to gather evidence, but trying to form linkages even if it's not really there. Among other suspected Bad Things that the company is doing. It makes sense considering how big the company is that it would have a naysayer. It would probably be a novelty enough for a station to aire, even if at a bad time slot. This would like you say, obviously rankle feral labs, especially if they tried to raise a lawsuit against him. BUT on that same note, would have to be VERY careful as to how they "disappear" him without turning him into proof positive of his theories.

Howie sounds like a fun character to play! He's got personality, isn't CRAZY, and would be easy to disappear ^_^.

Honestly, though, as far as the way onto the island - it sounds a bit overblown compared to the rest of the character. Just as a suggestion, It would be just as likely for a scout for Feral Labs to have gotten his medical information from a time he might have been brought into a low-cost urban clinic for a scrape.
Once his info was in the systems, he might have been selected as a subject by Moreau, and a street rep offering him a good wad of change to do a job for them...
It just sounds more plausible for the scale of the character versus the international chase and being dropped for dead in international waters.
Heck, he might have even gone scouting for a way out of the city (and answered one of the ads that Feral Labs runs in some papers for a community for homeless (on approval)) to get away from the mob boss if you are attached to that aspect of his past.

Other than that the character sounds great :3