After a lot of thinking I have figured out which of my current OCs turns into a pudgkin.
Gerarde: http://vocol.deviantart.com/art/Gerarde-Ref-Sheet-EDIT-394458557

As you may notice, there are some interesting things about this pudgkin.
Mutations seen here make it rare, butterfly ears and vampire teeth as well as open eyes.
Any pudgkin made with vampire teeth will not be a vampire, that only happens like once in a thousand years and Gerarde happens to be that one. Also, another mutation is the double colored eyes, the ones that can open their eyes all the way only have one color in their eyes. This mutation would make the pudgkin very rare.

So Gerarde is a very rare teacup pudgkin!

Pudgkins/Gerarde © Vocol
Do not use this without my permission in any shape or form! Pudkins are a closed species right now.