Honestly, even if you basically reused the character (and from what I can see you didn't), it hardly matters one way or the other; happens enough in professional writing at any rate.á That said, I'm having a hard time seeing the wolf as Chad's zanpakuto, though to be fair I can't really see anything else doing a better job:á he's just Chad.á Anyway, we didn't really get to see much of her - it's hard to form a good opinion of her character.
What I have planned for Chad and his zanpakuto is her spending a lot of time simply refusing to come out, sometimes taunting him as 'fangless', but overall being a pleasant sort. I wanted that little glimpse to set the mood of that whole relationship.
Note that for all her stubborness, she still came by when Chad had a nightmare. She just thinks he is too stubborn and set in his ways to accept her yet, given the shikai is an axe - something outright oriented for, seemingly, maximum violence. Hence the dichotomy.
I'm having way more fun with it than I should, really.
You've got the harvest, hearth and protector thing going on, but what's that mean for Chad's inner world; yeah there's his friends, but so much of the inner world is built on images and Chad's seems to be barren of the most important thing - maybe it wasn't intentional, but that's kind of macbre: a sheppard without a herd and a home with no one to house. I can see it, but there's kind of some grim undertones; shows him as a little needy too, which is an unexpected if intriguing interpretation of his character.
Maybe its just me, but I keep getting this image of Chad walking through the village, the doors to the houses are thrown open and various meals are slowly cooling on the table. There's tools scattered about the fields, stained with dirt, but there aren't any people: it's basically a ghost town. It feels liked something out of a horror movie, you can't help but ask yourself where did everyone go.