Okay!!! Going to take a crack at answering these and hope I can help out ;v;/

I'm mentioned this earlier today but, at this point I'm kind of interested in more punk or street based designs ?? I feel like this isn't something I've seen very often, though maybe I'm just also not looking in the right places. Off the top of my head I can't think of any that I'm tired of seeing per say, but it any come up I'll be sure to edit this comment or reply to it or whatever and let you know!

As for the character being partially developed, this probably isn't how other people decide on adopts, so I don't know if this is the best opinion to have but I usually want adopts when I can see myself giving the character character traits myself. As in I could see them being x personality or getting along with a character or something. So I think that while personality traits would be interesting!! That they should be optional like you said above, or maybe that could hinder someone buying an adopt. Or in some cases, it might have someone want the adopt ?? That's kind of tricky hmm..

As for what catches my eye, what I said above is usually the case if that makes sens e. And I usually go with premade, but that's because I'm just generally indecisive omg. I think having a mixture of premade and custom (with custom being after a few premades are made to show your designs and such) would be the best option to go with!! I hope this was able to help you at least a little bit, and that you're able to sell a lot of adopts!! \ o /