I've had a fairly hard time coming up with creature concepts, which I think is because I hadn't refined the testimonial descriptions into more specific creature types. I went back over my testimonial and applied the traits I'd listed to specific creature types that I used to imagine, as well as adding more that I've remembered since my initial testimonial. I then went over my brother's testimonial and applied his descriptions to the types of creature they fit best.
Biped - Humanoid
Approximately human height
Bark-like skin
Branch-like limbs
Bent/misshapen bodies
Agile
Silent
Stalk their prey
Predators
Hunt from the trees - unseen
Voices sound like creaking trees
Fast
Use some primal weaponry
Slim
Feral
Hunt in packs
Can walk/run on two legs as well as all fours
Protruding spines
Strangely-coloured eyes
Biped - Giant
Much taller than humans
Most have bark-like skin (others can be slightly fleshy with foresty accents)
Very strong
Some have horns (not just on the head)
Loud - booming voices and footsteps
Hunt and capture other creatures and humans
More advanced than most other forest creatures but still simple-minded
Some use primitive weapons
Move quickly due to their large size and long strides
Reminiscent of Tolkien-style trolls or Norse Jotun
Always alone
Territorial
Quadruped
Animalistic
Large variety of species
Some resemble big cats, apes, rhinos and bison
Many tower overhead
Very heavy
Bark-like skin
Branch-like horns
Mossy/grassy fur
