Prone to shedding into food, open mouths, and eyes. Dolichocephalic. Clownish, undignified demeanor. Earlobes not beginner level. Tremors, twitching or uncontrollable muscle movements. Dry mouth, upset stomach, constipation, Diarrhea Planet. Anxiety, restlessness, general deep-seated state of discomfort. Hole digging: high. Tendency to drool. Mindless yapping: it's happening evn now. Convinced of shared waking nightmare. Repeated claims that it's not a coincidence that the bible has a lesser-known 151st psalm, which is only in the Eastern Orthodox version of the Bible (and a tiny number of others), and there were 'officially' only 150 Pokemon until it was revealed that there was a secret 151st Pokemon, Mew. Emotional sensitivity to strangers knocking on the door. Possible legal liabilities (may be targeted for banning in certain areas). Short lifespan, presumably. 

That's about it, except for everything else