Hi there, I'm an Industrial Designer, expert at 3d modeling and rendering, I have created characters for 3d printing before, same as what you're asking I would say, I have the samples of these characters in my portfolio, I can provide you with 3d print ready files and renderings, please take a look at my portfolio for more reference of my work and the quality you can expect from me.
Freelancer portfolio:
https://www.freelancer.com/u/JoseDuranC
Please don't hesitate to contact me for more information or to discuss in more detail your project, thank you.