Isaiah was human, the more Kael looked at the suffering humanoid, the more Kael had the uncanny feeling that Isaiah had somehow turned into a human.
Since he came to this world, the closest thing to a human was the tier 3 lion equivalent who gained the ability to change into humanoid forms.
These forms were only humanoid in appearance and always had some traits of their true form on them.
The lions and lionesses had traits like lion ears, tails, and claws. They also tended to be around six feet tall, both male and female.
Avians in their humanoid forms were also usually tall and slim, having feathers for hair and clear eyes. They also tended to have holes where their ears were supposed to be.
This was how it was for many creatures in their humanoid forms. They just looked like humans with added traits to them, like the beastmen from fantasy novels.