The Malfoys.and Bella I really love them, I think they make such great subjects of character study because, as opportunistic and ambitious as they are, all three are EXTREMELY loyal to each other. But, tbh I don't really like Bellatrix.
Similar to the scene where he dances with her after Ron leaves. The series did a good job with portraying realistic, platonic boy-girl friendships. A boy and girl can be best friends, they don't always have to have an undertone of romance.