I'd say security for a guy who takes his job too seriously. Maybe ex-military or ex-cop demoted to security and pulled into this film as a favor for a job. He'd know how to survive in the wild, though he's definitely a glass half empty type of attitude right now.
Yeah! I'm good with that. It could be anything from fantasy to scifi in the range. I'm not sure we need to hammer out anything else. Really the island seemed remote which is why they're filming there but clearly someone didn't do their research. (Or, plot twist, someone did know the state of the island so that's why they chose that location!)
So we're thinking like the captain of the ship and his crew, the film crew, security, etc. Maybe like 25-50 people? Death and destruction could be generalized to those lacking in flavor and we can just mix in a few people close to them to flesh it out.