“‘Gryffindor, where dwell the brave at heart!’ Like my dad.” Snape made a small, disparaging noise. James turned on him. “Got a problem with that?” “No,” said Snape, though his slight sneer said otherwise. “If you’d rather be brawny than brainy – ” “Where’re you hoping to go, seeing as you’re neither?” interjected Sirius.
Sirius, James and Severus in The Deathly Hallows.
“Think my name’s funny, do you? No need to ask who you are. My father told me all the Weasleys have red hair, freckles, and more children than they can afford.” He turned back to Harry. “You’ll soon find out some wizarding families are much better than others, Potter. You don’t want to go making friends with the wrong sort. I can help you there.” He held out his hand to shake Harry’s, but Harry didn’t take it. “I think I can tell who the wrong sort are for myself, thanks,” he said coolly.
Harry, Ron and Draco in The Philosopher's Stone.
The parallels between Harry and Sirius are both beautiful and heartbreaking. As are the differences.