I just looked up “Byronic hero” on Wikipedia and, well, here’s a few quotations from the entry:
“a man proud, moody, cynical, with defiance on his brow, and misery in his heart, a scorner of his kind, implacable in revenge, yet capable of deep and strong affection”
“That man of loneliness and mystery, Scarce seen to smile, and seldom heard to sigh—”
“Lone, wild, and strange, he stood alike exempt From all affection and from all contempt”
“Lonely, melancholy, of fine natural physique, which has become in some way ravaged … dark and brooding in expression, of a cold and cynical veneer, above all enigmatic, in possession of a sinister secret.”