Picture books are for kids, and so with very few exceptions, the character in the story should be a kid. If it is not a kid, say it's a bear, then that bear should be kid-like, or have characteristics of a kid.
Why?
Because we want the audience to be able to relate to the character.
Great examples: Mo Willems - everything especially the "Pigeon" series for an example of a nonhuman child like character.
"Milo Imagines the World" is a stunning example of a kid character and how they see the world.
Even when the character is technically an adult like the Amelia Bedelia series, Amelia acted very child-like.
Read some picture books - study the characters. Who are they? How do they act? What are they curious about? What does their voice sound like?
Happy writing!
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