I got this idea long ago from seabaguettee I think. I don't know if he said cats or not and I'm too lazy to go check so here's the cat version.
1. Gray Yeon
We don't need an explanation, it's a cat and a book so Gray.
2. Alex Go
I chose this cat, because its eyes are just so pretty! Alex's eyes are really pretty as well so... I guess it works.
3. Ben Park
This cat just screams Ben. The brown fur to go with Ben's beautiful tan and the fluffy fur that makes the cat appear bigger, just like Ben's muscles make him be bigger are the things that determined me to connect these two.
4. Gerard Jin
I feel like he stares into your soul constantly, but you can't see it since his bangs cover his eyes.
5. Eugene Gale
See that terrified face? If Eugene had a cat, it'd look like this one.
6. Rowan Im
Adorable, beautiful, incredible, brilliant, never the same, totally unique.
7. Teddy Jin
Teddy is a little hyperactive child so of course I had to give him this cat.
8. Donald & Kingsley
Just two bros acting cool.
9. Wolf Keum
He might be strong, but we all know that in the eyes of his opponents who know nothing about him, he looks like this innocent little fur ball.
10. Jake Ji
Just yes.
11. Jimmy Bae
I chose this cat, because Jimmy is beautiful.
12. Forrest Lee
I have no idea why I chose this one for him.
13. Dean Kwon
Our nice fashion icon. We'll let him have a moment.
14. Eunchan Hong
The cat looks like a baby. Eunchan is baby. It makes sense.
15. Dongha Baek
That's the closest to long black locks I could find so yeah, Dongha.