My favorite character from Supernatural is Dean Winchester, not only because he is funny, awesome, hilarious, and a lover of pie; but because he feels so deeply, most often for his brother Sam. Dean is the best :D
Picture this; Sherlock steps outside 221B Baker street to meet none other than the Doctor himself! What does he do? What does he say? Nothing of course, he quickly deduces the Doctors entire life story and we get a glimpse into his mind, while the Doctor stands there impressed with the attention and meeting someone of equivalent intellect.