Put a Cat in the Story

There's one more character I'm debating about including in Arrin's story. He was part of the story from the beginning, but as I've developed the story more, he seems to have gotten squeezed out. Most of the time I forget I was even going to include him.
He's not a human. He's more of a troublesome cat-spirit thing.

I still like his story, though I'm afraid I may end up having to move it somewhere else. If I'm lucky, I'll find I do need him here. So far he seems mostly a source of protection. Though his particular abilities may or may not be relevant to the circumstances.

Another thing that makes me hesitate is that I just read part of a book with a character very similar to him in appearance, origin, and name.
Sigh.