When Sparity used an item call "Dragon Stone". She can transform herself into the white mammals dragon form. While being in this form she will lost ability to use magic but gain ability to fly and breath fire. This body have a tough skin with high resist to physic attack but weak to magic attack. She can stay in this form as long as she please until she used Dragon Stone to transform back to Unicorn form.
She is a main character in my comic "Crazy Future".
I'd say it depends on if her personality changes to match her body. It would make sense, seeing as a lot of our reactions are based on physiology instead of psychology. We don't know enough about Equestrian dragons to know how they normally are. All we know is they're cranky when woken up, don't take kindly to kids breaking in to their homes, and are assholes as teenagers... Holy crap! I'm a dragon!
I'd say it depends on if her personality changes to match her body. It would make sense, seeing as a