I like Bolin well enough, but his plotline in Book 2 is... not good. At all. His relationship with Eska is abusive, but played up for a laugh, which I do not appreciate. And the entire mover sub-plot is a colossal waste of time, with its own share of uncomfortable dynamics - this time with Ginger. He gets better later, but I feel like he's often a vessel for the show's mistimed comic relief - are you sure you want to be making jokes when (spoilers) a terrorist is threatening to kill dozens of airbenders, including the girl you're sweet on?