In any fantasy Genre, or any science fiction genre, there's always this one race that look like humans, demons that also look like thin fit humans.
Then you got robots having "perfect forms" that look human
This spoil probably full of a lot of examples V
I won't go any further.
Even when it's not needed, we always use it non corporeal characters when suggesting a design.
Character who didn't have a humanoid appearance before.
Aliens who have no relations to us.
Robots when the most effective ones are quadrupedal.
We give it to inanimate objects too.
Even when the character doesn't look like a human, they share the body characteristics of one.
And at times they in the mercy of Plot and are saved, or are more important than the non human based characters.
They are even more powerful than their previous non-human forms.
in other situation even the character is more powerful or portrayed that way than their peers and they look human.
Why is that?