A superior thinker than a majority of the community. An individual who posseses the intellect to have other beliefs than social programming teaches us. Most deviants make a positive footprint on society, rather than the misconceived negative version. Deviants are simply individuals who differ in many aspects to the larger flock of society.
A deviant could include homosexuals and inventors etc.
Somebody with a particularly disturbing sexual preference or straying abnormally far from the norm.
James is a deviant that likes to use tentacles and other odd devices when thinking about sex. When he has sex, you will know from the screams of horror and disgust. This extreme deviance is severely harmful to the mental health of all effected.