SOLVED. YA Scifi Book about frankenstein type man on man-made island [s]

[Thoeny]

This is extremely vague, I read it in fourth or fifth grade so that would put the publication date before 2010 I believe. It took place on some sort of dystopian man-made island, or possibly just a city with a large wall facing the ocean.
One of the characters is part mechanical part human remains, he starts out bad but at one point a bird flies through his window and he nurses it back to health. I believe at one point he takes off in a boat into the ocean that nobody ever returns from.

I will try to remember more details, please this has been bothering me for years!

[Thoeny]

Oh! I remember it has some storm themed word in its title, maybe lightning or thunder?

[Kris]

Thoeny, are there other Frankenstein-like characters on the island? Does someone new arrive on the island?

Can you tell us about the creator or how these creatures came to be? (Spoilers are okay - just give us a clear warning before revealing a spoiler.)

Is this a horror novel?

Can we eliminate The Monstrumologist by Rick Yancey?

[Thoeny]

Hi Kris, thank you for the reply! I really wish I had more details. As far as I'm aware this man was the only thing of his kind, but it was a full city with people. I cannot remember how he was created. I do not beleive it was a horror novel it seemed more dark scifi - adventure in the veign of something like the hunger games

[Gillian]

Is it maybe Prodigal Son by Dean Koontz?

[Thoeny]

I don't think so, but this one does look like something I would read

[Gillian]

Do you know if it was sci-fi or fantasy?

[Thoeny]

It seemed much more like dystopian scifi

[Gillian]

I know you read the book in fourth or fifth grade, but was it a middle-grade, YA, or adult book?

[Thoeny]

It seemed very YA, I Might have gotten it from the scholastic book fair but have not been able to find it

[Gillian]

Storm Thief by Chris Wooding?

[Thoeny]

THATS THE ONE HOLY SHIT IM SO HAPPY THANK YOU SO MUCH

[Gillian]

:D