I know this will probably be a hot take but I think this might be my favorite iteration of Mycroft. He's clearly frustrated with Sherlock's shenanigans but I love that you can see his genuine affection for his brother coming through even when he's trying to keep him in line. You can also tell how much his actions are driven by the fear of losing him the way they lost Beatrice. He can't save his little sister so he will do everything, even bend the rules a bit, to save his little brother. And he's not just doing it because he's scared himself, he also wants to spare their mother the pain of potentially losing another child. This "softer" version of him is just an interesting take on the character imo













