Sirius Black a picture in so many words
Physically, he has gorgeous dark hair that flops perfectly into place. Cold grey eyes, which hold the secrets to the inner depths of his soul, if only one could find the key. He is tall, and muscled from hours of Quidditch training. He has a smile that lights up his whole face. And a laugh that's infectious. When he's angry it's like a storm has covered his face, and when he's hurt the corners of his lips pinch together as he tries not to show it. He has perfected the mischevious look, a glint in the eyes, slight upwards turn of the lips, hands behind the head, rocking back in the chair.
On the surface he appears relaxed, casual, at ease. Quick to anger, but quick to calm. He is playful, a prankster extroadinnaire. An effortlessly brilliant student, charming his way In and out of trouble.
To those who know him, he's the best friend anybody could ever ask for. Loyal. Insightful. Fun. Taking secrets to the grave. Ready and waiting when he senses something's wrong, but not pushing it. Always eager to go on midnight adventures, or take part in the latest crazy scheme.
To those who really know him, he's the boy who suffered through a childhood surrounded by hatred, and came out the other side a decent, if somewhat messed up, person. Sometimes, rarely, he slips and the barriers break down. That's when the anger really comes into play. He's ready to fight for what he believes, and to die for those he holds dear.
A marauder at heart. Loyal to the end. And a betrayed, falsely accused man.