Russel really is kinda just there getting angrier with each video.
If you look at official tweets from Murdoc you can tell he cares to some extent about the group and feels bad for abusing them, it's the fact that he doesn't stop abusing them that makes him a bad person. Murdoc does end up realizing that he's the bad guy in this situation and tries to be less shitty, emphasis on the 'tries' but he'll get there eventually. I think especially after The Lost Chord, Murdoc truly has a chance to fix his mistakes.
Russel is probably the only member that doesn't exactly do much.
Noodle goes to Japan and learns more about where she came from and all that.
Murdoc slowly learns how to not be an asshole.
2D finally experiences true happiness and feels freedom.
Russel... Russel is just Russel.
Oh and Ace is in the desert for some reason.