West Coast Eagles star ruckman Nic Naitanui says writing his new children's book Little Nic's Big Day was "more challenging" than he thought it would be.

"You think someone just chucks a bunch of pictures and words together but it's a long process... it's got to appeal to the children but also the parent reading it as well."

He says he featured a diverse range of characters in the book because "Australia's a very multicultural country and acceptance is a really big thing. For myself, at school I found it challenging... I was the odd kid out. I was the tall, dark, skinny kid who didn't really fit in."

Little Nic, Little Nic, come look and see,

I'm different to you and you're different to me.

Our skin is brown and our hair is curly,

But you sleep in late and I get up early.

I love to cook, you love to eat,

But only you have smelly feet.