This one I always pictured as being spawned by the evil antics of this knuffel of mine. http://www.theotaku.com/fanart/view/355352/gen_6_darkness_knuffel
I picture them both being poison based knuffels. Shes the far more fun poison one tho. I am planning on giving her the poison skill so that when the battle system does launch she can use it. XD
Overall I picture her as being very tiny, about 7-8 inches tall. So I drew her as a chibi to express that.