aformist
One who doesn't restrict themselves to known forms or patterns. Similar to a nonconformist, an 'aformist' is defined by random behavior, stemming from a variety of perspectives and experiences. Aformists aren't typically anarchist by nature, but have from time to time shared the occasional similarity.
"I dunno, I think Judy's been acting a bit aformist lately. She was playing cards with me this afternoon, and suddenly she gets up and makes brownies. Totally out of the blue."