The black brothers
You will probably find the story about the last male members of an important family very interesting and their stories and how they helped harry potter kill lord Voldemort. They were also different from other members of their family, even Regulus was. I was not in either of their classes at Hogwarts as I was in ravenclaw and 1 year younger than Regulus. I only got a tiny impression of them. Their lives were different but also similar. These two heroes both fought Voldemort. From what I saw at school, Sirius was also arrogant and was friends with James Potter. Sirius hexed people with James and was obsessed with Severus Snape. Severus Snape became a slytherin war hero just like Regulus Black. Anyway, what is so interesting about him is that he was put into Azkaban but still carried on and never took revenge on the ministry. He put his wrath on the bad people and was brave. He had his flaws but was a good man.
Regulus seemed like a slytherin who was part of gangs. He was like the others but used lesser dark magic infrequently. He referred to muggle borns as mudbloods. He was a quidditch hero and was like James potter in some ways in that he was arrogant. People who were hexed by James potter would certainly say that. He ultimately sacrificed himself.
That is what this is about.