A natural altruist, and a sadist by choice and preference.
A man who revels in chaos, violence, and debauchery, but at the same time is compelled to aid and heal against his better senses and self interests.
A being for whom 'good' is a curse inflicted by his psyche and more often than not an unconscious reflex, a expression and manner enacted unbidden, and for whom 'evil' is a chief study and amusement- a delight indulged but not necessarily inherent.
Such a man would by his own be damned twice over, unable to wholly understand limitation or morality of those with a clear and fixed moral path in either spectrum, and voicing freely both on whim. If self aware, at the same time, he could voice some truly curious stories of mixed perception and offer duality as morality with honest belief. Such a man would be both quick to kindness and to bloodrage, to love and to jealousy, overbrimmed with emotion and insane from any sensible balanced perspective.
This man is our candidate for the Black Knight, a man of both Chivalry and its farthest foes. A man that sensibly should be impossible or improbable and usually exists without the realms of Sense. This being we seek and know.