PlEaSe. LeT tAiLs DoLl HiMsElF aNsWeR tHiS. i Am A bEiNg CoMpOsEd Of EvIl EnErGy. I wAs sEwN iNtO tHe BoDy Of A fOx DoLl FoR rEaSoNs I dOn'T eVeN kNoW.
If you think about this question literally, he might not be so cute under his skin. He might be a robot wearing a costume, since the other characters in sonic r were robots. I think he's not evil. Maybe he wears a cute costume to hide his ugliness.
