From my two current projects...
Captain Zeydrick
1. He's got a gruff exterior but it's a facade
2. He's overprotective of the people under him
3. He will never admit it, but he actually doesn't hate humanity as much as he insists
4. If it were a choice between a dog or a cat, he'd go with a cat. They're unobtrusive and don't radiate heat.
5. The thing he misses most about his original form is flying.
Felix
1. He only went on the trip because Nikki was going
2. He has absolutely no interest in studying plants
3. He's the type that will watch a horror film and be fine - until the lights go out and it's time to sleep. Then he's wide awake and terrified.
4. He's subconscious about his short tail but tries to hide it with jokes.
5. When his father died, the only thing Felix wanted was to have his father's arms around him again. That's why his mother insisted he take his father's leather jacket.